Merge pull request 'release: v1.6.0 — promo deep-link seeds EN variant (+ UI nits)' (#135) from development into master

The promo message body now renders "@<bot>" as an HTML text_link to the same ?startapp deep link the button uses (ParseMode HTML), so tapping the mention opens the seeded Mini App instead of the bot profile. Same payload (campaign start-param, else the forwarded /start payload) backs both the button and the mention.

.gitea/workflows/ci.yaml

@@ -267,6 +267,7 @@ jobs:
           TELEGRAM_MINIAPP_URL: ${{ vars.TEST_TELEGRAM_MINIAPP_URL }}
           TELEGRAM_GAME_CHANNEL_ID: ${{ vars.TEST_TELEGRAM_GAME_CHANNEL_ID }}
           TELEGRAM_CHAT_ID: ${{ vars.TEST_TELEGRAM_CHAT_ID }}
+          TELEGRAM_SUPPORT_CHAT_ID: ${{ vars.TEST_TELEGRAM_SUPPORT_CHAT_ID }}
           TELEGRAM_BOT_USERNAME: ${{ vars.TEST_TELEGRAM_BOT_USERNAME }}
           # The promo button reuses the UI's Mini App link variable.
           TELEGRAM_BOT_LINK: ${{ vars.TEST_VITE_TELEGRAM_LINK }}

.gitea/workflows/prod-deploy.yaml

@@ -179,6 +179,7 @@ jobs:
       TELEGRAM_MINIAPP_URL: ${{ vars.PROD_TELEGRAM_MINIAPP_URL }}
       TELEGRAM_GAME_CHANNEL_ID: ${{ vars.PROD_TELEGRAM_GAME_CHANNEL_ID }}
       TELEGRAM_CHAT_ID: ${{ vars.PROD_TELEGRAM_CHAT_ID }}
+      TELEGRAM_SUPPORT_CHAT_ID: ${{ vars.PROD_TELEGRAM_SUPPORT_CHAT_ID }}
       TELEGRAM_BOT_USERNAME: ${{ vars.PROD_TELEGRAM_BOT_USERNAME }}
       TELEGRAM_BOT_LINK: ${{ vars.PROD_VITE_TELEGRAM_LINK }}
     steps:
@@ -200,6 +201,7 @@ jobs:
           export TELEGRAM_MINIAPP_URL='$TELEGRAM_MINIAPP_URL'
           export TELEGRAM_GAME_CHANNEL_ID='$TELEGRAM_GAME_CHANNEL_ID'
           export TELEGRAM_CHAT_ID='$TELEGRAM_CHAT_ID'
+          export TELEGRAM_SUPPORT_CHAT_ID='$TELEGRAM_SUPPORT_CHAT_ID'
           export TELEGRAM_PROMO_BOT_TOKEN='$TELEGRAM_PROMO_BOT_TOKEN'
           export TELEGRAM_BOT_USERNAME='$TELEGRAM_BOT_USERNAME'
           export TELEGRAM_BOT_LINK='$TELEGRAM_BOT_LINK'

backend/internal/account/profile.go

@@ -101,6 +101,66 @@ func validateVariantPreferences(prefs []string) ([]string, error) {
 	return out, nil
 }
 
+// variantSeedPrefix marks a Telegram start-param payload that seeds a brand-new
+// account's variant preferences (e.g. "verudit_ru-scrabble_en"): the prefix, then the
+// canonical variant labels joined by "-". It is deliberately distinct from the routing
+// deep links (g/i/f; see platform/telegram .../deeplink) so the client's start-param
+// router falls through to the lobby for it.
+const variantSeedPrefix = "v"
+
+// SeedVariantsFromStartParam decodes a promo deep-link start-param into the variant
+// preference set to seed onto a brand-new account: the variantSeedPrefix followed by
+// the canonical variant labels joined by "-" (e.g. "verudit_ru-scrabble_en"). It
+// returns nil for any payload that is not a variant-seed link or that fails validation
+// against the known variants, so a malformed, empty or unrelated start-param simply
+// leaves the account on its default preferences rather than failing the login.
+func SeedVariantsFromStartParam(startParam string) []string {
+	if !strings.HasPrefix(startParam, variantSeedPrefix) {
+		return nil
+	}
+	body := strings.TrimPrefix(startParam, variantSeedPrefix)
+	if body == "" {
+		return nil
+	}
+	prefs, err := validateVariantPreferences(strings.Split(body, "-"))
+	if err != nil {
+		return nil
+	}
+	return prefs
+}
+
+// SetVariantPreferences overwrites only the variant-preference set of the account,
+// cleaning it to a deduplicated, canonically ordered subset of the known variants
+// (rejecting an empty or unknown set with ErrInvalidProfile) and bumping updated_at; it
+// reports ErrNotFound when no account matches id. It is the narrow counterpart to
+// UpdateProfile used to seed a promo-onboarded account's variants at first contact
+// without disturbing its other profile fields.
+func (s *Store) SetVariantPreferences(ctx context.Context, id uuid.UUID, prefs []string) (Account, error) {
+	clean, err := validateVariantPreferences(prefs)
+	if err != nil {
+		return Account{}, err
+	}
+	stmt := table.Accounts.UPDATE(
+		table.Accounts.VariantPreferences, table.Accounts.UpdatedAt,
+	).SET(
+		// clean is validated against the closed knownVariants set; bind as a text[]
+		// parameter (lib/pq encodes the array, the cast pins the column type), mirroring
+		// UpdateProfile.
+		postgres.Raw("#variant_prefs::text[]", map[string]interface{}{"#variant_prefs": pq.StringArray(clean)}),
+		postgres.TimestampzT(time.Now().UTC()),
+	).WHERE(table.Accounts.AccountID.EQ(postgres.UUID(id))).
+		RETURNING(table.Accounts.AllColumns)
+
+	var row model.Accounts
+	if err := stmt.QueryContext(ctx, s.db, &row); err != nil {
+		if errors.Is(err, qrm.ErrNoRows) {
+			return Account{}, ErrNotFound
+		}
+		return Account{}, fmt.Errorf("account: set variant preferences %s: %w", id, err)
+	}
+	return modelToAccount(row), nil
+}
+
 // UpdateProfile validates and overwrites the editable fields of the account, then
 // returns the stored row. It reports ErrInvalidProfile for a bad language,
 // timezone or display name and ErrNotFound when no account matches id.

backend/internal/account/variant_seed_test.go

@@ -0,0 +1,37 @@
+package account
+
+import (
+	"slices"
+	"testing"
+)
+
+// TestSeedVariantsFromStartParam covers decoding a promo deep-link start-param into the
+// variant-preference set to seed: a valid "v"-prefixed, "-"-joined label list is cleaned
+// to the canonical order and deduplicated, while anything that is not a variant-seed link
+// or that names an unknown variant yields nil (leaving the account on its defaults).
+func TestSeedVariantsFromStartParam(t *testing.T) {
+	tests := []struct {
+		name  string
+		param string
+		want  []string
+	}{
+		{"english promo", "verudit_ru-scrabble_en", []string{"erudit_ru", "scrabble_en"}},
+		{"single variant", "vscrabble_en", []string{"scrabble_en"}},
+		{"canonical order regardless of payload order", "vscrabble_en-erudit_ru", []string{"erudit_ru", "scrabble_en"}},
+		{"deduplicated", "verudit_ru-erudit_ru", []string{"erudit_ru"}},
+		{"empty", "", nil},
+		{"prefix only", "v", nil},
+		{"routing game link is not a seed", "g0190abcd", nil},
+		{"friend code link is not a seed", "f123456", nil},
+		{"unknown variant rejected", "vscrabble_de", nil},
+		{"one unknown label rejects the whole set", "verudit_ru-scrabble_de", nil},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := SeedVariantsFromStartParam(tc.param)
+			if !slices.Equal(got, tc.want) {
+				t.Errorf("SeedVariantsFromStartParam(%q) = %v, want %v", tc.param, got, tc.want)
+			}
+		})
+	}
+}

backend/internal/inttest/promo_variant_test.go

@@ -0,0 +1,80 @@
+//go:build integration
+
+package inttest
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+	"go.uber.org/zap/zaptest"
+
+	"scrabble/backend/internal/account"
+	"scrabble/backend/internal/server"
+	"scrabble/backend/internal/session"
+)
+
+// TestTelegramAuthSeedsPromoVariantForNewUserOnly drives the sessions/telegram endpoint
+// to confirm a promo deep-link start-param seeds a brand-new account's variant
+// preferences (English Scrabble alongside the default Erudit), that a new account with no
+// such payload keeps the Erudit-only default, and that an existing account is never
+// re-seeded on a later login (the new-user-only contract).
+func TestTelegramAuthSeedsPromoVariantForNewUserOnly(t *testing.T) {
+	srv := server.New(":0", server.Deps{
+		Logger:   zaptest.NewLogger(t),
+		DB:       testDB,
+		Accounts: account.NewStore(testDB),
+		Sessions: session.NewService(session.NewStore(testDB), session.NewCache()),
+		Notifier: &captureNotifier{},
+	})
+	h := srv.Handler()
+
+	post := func(ext, startParam string) {
+		body := `{"external_id":"` + ext + `","language_code":"en","first_name":"Promo"`
+		if startParam != "" {
+			body += `,"start_param":"` + startParam + `"`
+		}
+		body += `}`
+		rec := httptest.NewRecorder()
+		req := httptest.NewRequest(http.MethodPost, "/api/v1/internal/sessions/telegram", strings.NewReader(body))
+		req.Header.Set("Content-Type", "application/json")
+		h.ServeHTTP(rec, req)
+		if rec.Code != http.StatusOK {
+			t.Fatalf("telegram auth = %d: %s", rec.Code, rec.Body.String())
+		}
+	}
+	store := account.NewStore(testDB)
+	reload := func(ext string) []string {
+		acc, err := store.AccountByIdentity(context.Background(), account.KindTelegram, ext)
+		if err != nil {
+			t.Fatalf("lookup %s: %v", ext, err)
+		}
+		return acc.VariantPreferences
+	}
+
+	// A brand-new account reached through a promo deep-link is seeded with English
+	// Scrabble alongside the default Erudit.
+	promoExt := "tg-" + uuid.NewString()
+	post(promoExt, "verudit_ru-scrabble_en")
+	if got, want := reload(promoExt), []string{"erudit_ru", "scrabble_en"}; !slices.Equal(got, want) {
+		t.Errorf("promo new account variants = %v, want %v", got, want)
+	}
+
+	// A brand-new account with no promo payload keeps the Erudit-only default.
+	plainExt := "tg-" + uuid.NewString()
+	post(plainExt, "")
+	if got, want := reload(plainExt), []string{"erudit_ru"}; !slices.Equal(got, want) {
+		t.Errorf("plain new account variants = %v, want %v", got, want)
+	}
+
+	// A later login of the promo account, even via a different payload, must not re-seed:
+	// the seed is first-contact only.
+	post(promoExt, "vscrabble_ru")
+	if got, want := reload(promoExt), []string{"erudit_ru", "scrabble_en"}; !slices.Equal(got, want) {
+		t.Errorf("existing account re-seeded = %v, want unchanged %v", got, want)
+	}
+}

backend/internal/server/handlers_auth.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
+	"go.uber.org/zap"
 
 	"scrabble/backend/internal/account"
 )
@@ -19,13 +20,16 @@ import (
 // telegramAuthRequest carries the identity the connector extracted from a
 // validated initData payload. Username, FirstName and LanguageCode seed a
 // brand-new account's display name and language; BrowserTZ (the client's detected
-// "±HH:MM" UTC offset) seeds its time zone (first contact only).
+// "±HH:MM" UTC offset) seeds its time zone; StartParam is the validated launch
+// deep-link payload, which may seed the new account's variant preferences (first
+// contact only).
 type telegramAuthRequest struct {
 	ExternalID   string `json:"external_id"`
 	Username     string `json:"username"`
 	FirstName    string `json:"first_name"`
 	LanguageCode string `json:"language_code"`
 	BrowserTZ    string `json:"browser_tz"`
+	StartParam   string `json:"start_param"`
 }
 
 // handleTelegramAuth provisions (or finds) the account bound to a Telegram
@@ -47,6 +51,16 @@ func (s *Server) handleTelegramAuth(c *gin.Context) {
 		// joined the chat before registering is granted on the spot (no chat_member
 		// event fires on registration).
 		s.publishChatAccessChange(acc.ID)
+		// A promo deep-link may seed this brand-new account's variant preferences (e.g.
+		// English Scrabble alongside the default Erudit). Best-effort: an absent or
+		// malformed payload leaves the account on its defaults, and a write failure must
+		// not block the session mint.
+		if seed := account.SeedVariantsFromStartParam(req.StartParam); len(seed) > 0 {
+			if _, err := s.accounts.SetVariantPreferences(c.Request.Context(), acc.ID, seed); err != nil {
+				s.log.Warn("telegram: seed variant preferences failed",
+					zap.String("account", acc.ID.String()), zap.Error(err))
+			}
+		}
 	}
 	s.mintSession(c, acc)
 }

deploy/.env.example

@@ -47,9 +47,11 @@ AWG_CONF=                              # required; AmneziaWG sidecar config (the
 TELEGRAM_BOT_TOKEN=                    # required
 TELEGRAM_GAME_CHANNEL_ID=
 TELEGRAM_CHAT_ID=                      # moderated discussion chat (channel's linked group); empty disables gating
+TELEGRAM_SUPPORT_CHAT_ID=              # private forum supergroup for the support relay (topic per user); empty disables it
 TELEGRAM_PROMO_BOT_TOKEN=             # optional standalone promo bot token; empty disables it
 TELEGRAM_BOT_USERNAME=               # main bot @username without the @ (promo message); required when the promo token is set
 TELEGRAM_BOT_LINK=                    # main bot Mini App link for the promo button (reuse VITE_TELEGRAM_LINK); required when the promo token is set
+TELEGRAM_PROMO_START_PARAM=           # promo button startapp payload — a variant-seed deep link (default verudit_ru-scrabble_en) adding English Scrabble for new users; empty forwards the user's /start payload
 TELEGRAM_MINIAPP_URL=                  # required
 TELEGRAM_TEST_ENV=false
 TELEGRAM_API_BASE_URL=

deploy/README.md

@@ -150,7 +150,9 @@ Re-run `ansible/` after a host resize — it is idempotent.
 workflow manually (Gitea → Actions → prod-deploy → run from `master`, input
 `confirm=deploy`). It builds + pushes the images to the registry, ships the
 compose/config/certs/env over SSH, deploys the main host with `prod-deploy.sh` (rolling,
-health-gated, **auto-rollback to the previous tag**), then the bot host, then probes the
+health-gated, **auto-rollback to the previous tag**; caddy is force-recreated on its roll so
+a bind-mounted `Caddyfile` change applies — its image is pinned and admin is off, so neither a
+new tag nor a hot reload would pick it up), then the bot host, then probes the
 public site. After `master` is green this workflow is the **only** thing that touches
 prod — nothing auto-deploys there. It runs four visible jobs: **build → deploy-main →
 deploy-bot → verify** (the per-service rolling shows in the deploy-main log).

deploy/docker-compose.bot.yml

@@ -23,9 +23,15 @@ services:
       TELEGRAM_BOT_TOKEN: ${TELEGRAM_BOT_TOKEN:?set TELEGRAM_BOT_TOKEN}
       TELEGRAM_GAME_CHANNEL_ID: ${TELEGRAM_GAME_CHANNEL_ID:-}
       TELEGRAM_CHAT_ID: ${TELEGRAM_CHAT_ID:-}
+      # Support relay: a private forum supergroup the bot relays direct user messages
+      # into (one topic per user). 0/unset disables it; the bot needs admin there with
+      # the manage-topics and delete-messages rights.
+      TELEGRAM_SUPPORT_CHAT_ID: ${TELEGRAM_SUPPORT_CHAT_ID:-}
+      TELEGRAM_SUPPORT_STATE_DIR: /data
       TELEGRAM_PROMO_BOT_TOKEN: ${TELEGRAM_PROMO_BOT_TOKEN:-}
       TELEGRAM_BOT_USERNAME: ${TELEGRAM_BOT_USERNAME:-}
       TELEGRAM_BOT_LINK: ${TELEGRAM_BOT_LINK:-}
+      TELEGRAM_PROMO_START_PARAM: ${TELEGRAM_PROMO_START_PARAM:-}
       TELEGRAM_MINIAPP_URL: ${TELEGRAM_MINIAPP_URL:?set TELEGRAM_MINIAPP_URL}
       # Real Bot API in prod (the test contour pins TELEGRAM_TEST_ENV=true instead).
       TELEGRAM_TEST_ENV: "false"
@@ -46,8 +52,13 @@ services:
       GOMAXPROCS: "1"
     volumes:
       - ${SCRABBLE_CONFIG_DIR:-.}/certs:/certs:ro
+      # Support relay state (topic mapping, block list); survives redeploys.
+      - bot-state:/data
     deploy:
       resources:
         limits:
           cpus: "1.0"
           memory: 256M
+
+volumes:
+  bot-state:

deploy/docker-compose.yml

@@ -292,6 +292,11 @@ services:
       # only restricts (mutes the ineligible) — and the bot must be an admin there with the
       # "Ban users" right; chat_member updates are delivered only to a chat admin.
       TELEGRAM_CHAT_ID: ${TELEGRAM_CHAT_ID:-}
+      # The private forum supergroup the bot relays direct user messages into (one topic
+      # per user) and reads operator replies from. Empty disables the support relay; when
+      # set the bot must be an admin there with the manage-topics and delete-messages rights.
+      TELEGRAM_SUPPORT_CHAT_ID: ${TELEGRAM_SUPPORT_CHAT_ID:-}
+      TELEGRAM_SUPPORT_STATE_DIR: /data
       # The optional standalone promo bot (its own token) answering /start with a button
       # into the main bot's app. Empty disables it; when set it needs the main bot's
       # @username and the Mini App link (reused from the UI's VITE_TELEGRAM_LINK).
@@ -325,6 +330,8 @@ services:
       GOMAXPROCS: "1"
     volumes:
       - ${SCRABBLE_CONFIG_DIR:-.}/certs:/certs:ro
+      # Support relay state (topic mapping, block list); survives redeploys.
+      - bot-state:/data
     deploy:
       resources:
         limits:
@@ -496,3 +503,4 @@ volumes:
   prometheus-data:
   tempo-data:
   grafana-data:
+  bot-state:

deploy/prod-deploy.sh

@@ -74,7 +74,13 @@ health_running() { # health_running <container>: running, not restarting, stable
 roll() { # roll <service> <health-cmd...>
   local svc="$1"; shift
   echo ">>> rolling $svc -> $TAG"
-  dc up -d --no-build --no-deps "$svc" || return 1
+  # caddy's image is pinned (caddy:2-alpine, no $TAG) and its Caddyfile is bind-mounted, so a
+  # config-only change leaves the compose definition unchanged: `up -d` treats the container as
+  # current and does not recreate it, and admin is off so there is no hot reload — the new
+  # Caddyfile would never load. Force a recreate for caddy so config changes always apply; every
+  # other service already recreates on its new $TAG image.
+  local recreate=(); [ "$svc" = caddy ] && recreate=(--force-recreate)
+  dc up -d --no-build --no-deps "${recreate[@]}" "$svc" || return 1
   "$@" || { echo "!!! $svc failed health check"; return 1; }
   echo "<<< $svc healthy"
 }

docs/ARCHITECTURE.md

@@ -204,7 +204,7 @@ arrive from a platform rather than completing a mandatory registration).
 > recipient's interface language (`preferred_language`), with no per-bot routing. New
 > Game variant gating moved off the login language onto a per-user profile setting
 > `variant_preferences` (default Erudit only, server-enforced on the caller's create
-> paths; an invited friend may still accept any variant). The per-bot env vars and
+> paths; an invited friend may still accept any variant, and a Telegram **promo deep-link** seeds extra variants — e.g. English Scrabble — onto a brand-new account via the validated `start_param`). The per-bot env vars and
 > `GATEWAY_DEFAULT_SUPPORTED_LANGUAGES` were removed; the wire dropped
 > `service_language`/`supported_languages` and the push `language` routing field, and
 > gained `variant_preferences` on Profile/UpdateProfile.
@@ -1040,8 +1040,9 @@ a dedicated redeem sub-limit or a longer code is the hardening step if abuse app
 Single public origin, path-routed. The Vite build has two entries: a lightweight
 **landing page** and the game **SPA**. The gateway **embeds** the SPA build
 (`go:embed`, baked in by a node stage in `gateway/Dockerfile`) and serves it at
-`/app/` (web) and `/telegram/` (the Telegram Mini App; outside Telegram that path
+`/app/` (web) and `/telegram/` (the Telegram Mini App; on that path without sign-in data
-redirects to the root — the client-side guard); a stray hit on the gateway's `/`
+— no `initData` — the client renders a compact, shareable launch-diagnostic screen instead
+of redirecting away); a stray hit on the gateway's `/`
 308-redirects to `/app/`. The **landing** ships in its own static container: the
 `landing` target of `gateway/Dockerfile` (caddy:2-alpine + the same Vite build,
 `deploy/landing/Caddyfile`) serves it at `/`, so stray public traffic is absorbed by
@@ -1199,3 +1200,27 @@ blocks **only** feedback submission (unlike a suspension, the whole-account bloc
 granted from the feedback section (the delete-with-block checkbox) and granted/revoked from the
 `/users` console card. Roles are validated against a known set in Go, so adding one needs no
 migration.
+
+**Telegram support relay.** Separate from the in-app Feedback above, the bot offers a direct
+support channel for users who message it on Telegram. Any message other than `/start` is relayed
+into a private **forum supergroup** (`TELEGRAM_SUPPORT_CHAT_ID`): a user's first message opens a
+dedicated **forum topic** whose first message is an info card (the name is a tappable profile
+mention via a `text_mention` entity — which also keeps a name beginning with `/` from being read as
+a command — plus @username, language, premium, id) carrying a Block/Unblock toggle and a Clear
+button; every message is then
+copied into that topic (`copyMessage`, so any content — text, media, voice, files — carries over).
+Any **administrator** of the support chat who writes in a user's topic has their message copied
+back to that user; non-admins and the bot's own posts are ignored (the loop guard). Block drops the
+user's incoming messages (the topic stays); Clear deletes the relayed messages, keeping the info
+card; a topic the operators delete is reopened on the next message. State (user→topic map, block
+list, relayed message ids) is a small JSON file on a writable volume — the bot host has no database
+and cannot reach Postgres. The relay is **bot-local**: it touches neither the backend, the gateway,
+nor `feedback_messages`. The bot must be an administrator in the forum group with the manage-topics
+and delete-messages rights.
+
+> **Decision (2026-06-23) — bot-local support relay over forum topics.** The direct Telegram
+> support channel lives entirely in the bot (no backend, no bot-link command), because the bot host
+> has no database. One forum **topic per user** (not a reply-to-header thread) gives native per-user
+> separation and survives message deletion; the topic id, not a fragile header message, anchors the
+> mapping. Operators are the support chat's administrators (no separate owner id); messages relay
+> both ways with `copyMessage`. State persists as JSON on a dedicated volume.

docs/FUNCTIONAL.md

@@ -213,6 +213,9 @@ block **overrides but does not delete** an existing friendship (so you may block
 they keep seeing you as one); active games are never interrupted — you can finish them, with
 the blocked opponent's chat composer hidden (only the log remains). Blocking from a game card
 mirrors the block in **Settings → Friends**; **unblock** and **unfriend** live there only.
+On Settings → Friends each friend is a one-line row whose right-hand kebab (⋮) slides open
+**block 🚫** and **remove ✖️** icon actions, and each action is gated by a confirmation
+that names the friend (*Block this player?* / *Remove from friends?*).
 Blocking an **auto-match opponent who is secretly a robot** behaves the same in that game
 (struck name, hidden composer) and lists the blocked opponent under the name you saw, but is
 recorded only against that game — the disguise holds, the shared robot is never globally
@@ -250,8 +253,9 @@ merge".
 
 **Preferences (which variants you can be matched into).** A profile setting picks the game
 variants — Erudite, Russian Scrabble and English Scrabble, shown **Erudite-first** — you allow
-yourself to be matched into; a **new account starts with Erudite only**, and you must keep **at
+yourself to be matched into; a **new account starts with Erudite only** — unless it was created
-least one** selected. This list is exactly what **New Game** offers when you start a game
+through the **promo bot's deep link**, which also enables **English Scrabble** — and you must keep
+**at least one** selected. This list is exactly what **New Game** offers when you start a game
 (auto-match, an AI game, or a friend invitation you create) — a variant you have not enabled is
 not offered, and the server refuses it. It does not restrict games you are **invited** to: an
 invited friend may accept an invitation in **any** variant, and you can always open and play
@@ -269,6 +273,15 @@ marked read once the screen shows it and disappears a week later. A badge on the
 unanswered reply. Guests cannot send feedback (the entry is hidden). A player the operator has
 barred from feedback (a role, not a full account block) sees the send control disabled.
 
+### Telegram support chat
+A user can also reach the operators straight from the Telegram bot: anything they send the bot
+other than `/start` — text, a photo, a voice message, a file — is forwarded into the operators'
+private support group, grouped into a per-user thread. The user sees no automatic reply; an
+operator answers from that thread and the bot delivers the answer back as an ordinary bot message,
+so to the user it is a quiet one-to-one conversation. Operators can block a user (the bot then
+silently ignores their messages) or clear a thread's messages. This is independent of the in-app
+Feedback above — it serves people who write to the bot directly rather than through the app.
+
 ### History & statistics
 Finished games are archived in a dictionary-independent form and exportable to
 GCG; the export is offered **only once a game is finished**, and never for an

docs/FUNCTIONAL_ru.md

@@ -218,6 +218,9 @@ _Вход сейчас только через провайдера, поэто
 заблокированного соперника «подвал» чата скрыт (остаётся только лог). Блокировка с карточки в
 партии повторяет блокировку в **Настройках → Друзья**; **разблокировка** и **удаление из друзей**
 есть только там.
+В **Настройках → Друзья** каждый друг — однострочник, чей правый кебаб (⋮) выдвигает
+иконки-действия **заблокировать 🚫** и **удалить ✖️**, и каждое действие подтверждается
+диалогом с именем друга (*Заблокировать?* / *Удалить из друзей?*).
 Блокировка **авто-матч соперника, который втайне робот**, в этой партии ведёт себя так же
 (зачёркнутое имя, скрытый «подвал») и в списке заблокированных показывается под тем именем,
 которое ты видел, но записывается только для этой партии — маскировка сохраняется, общий
@@ -256,8 +259,9 @@ UTC; при создании аккаунта она подставляется
 
 **Предпочтения (в какие варианты тебя можно подбирать).** Настройка профиля задаёт варианты
 игры — Эрудит, русский Scrabble и английский Scrabble, показанные **сначала Эрудит**, — в
-которые ты разрешаешь себя подбирать; **новый аккаунт стартует только с Эрудитом**, и нужно
+которые ты разрешаешь себя подбирать; **новый аккаунт стартует только с Эрудитом** — если только
-оставить выбранным **хотя бы один**. Именно этот список предлагает **Новая игра**, когда ты
+он не создан по **диплинку промо-бота**, который дополнительно включает **английский Scrabble**, —
+и нужно оставить выбранным **хотя бы один**. Именно этот список предлагает **Новая игра**, когда ты
 запускаешь партию (авто-подбор, игра с ИИ или приглашение друга, которое ты создаёшь), — не
 включённый вариант не предлагается, и сервер его отклоняет. На партии, в которые тебя
 **приглашают**, это не влияет: приглашённый друг может принять приглашение в **любом** варианте,
@@ -275,6 +279,15 @@ UTC; при создании аккаунта она подставляется
 ответе. Гость отправлять обратную связь не может (пункт скрыт). Игрок, которому оператор запретил
 обратную связь (роль, а не полная блокировка аккаунта), видит кнопку отправки недоступной.
 
+### Чат поддержки в Telegram
+С операторами можно поговорить и прямо из Telegram-бота: всё, что пользователь присылает боту,
+кроме `/start` — текст, фото, голосовое, файл, — пересылается в закрытую группу поддержки операторов
+и собирается в отдельную ветку на пользователя. Пользователь не получает автоответа; оператор
+отвечает из этой ветки, и бот доставляет ответ обратно обычным сообщением — для пользователя это
+тихий диалог один на один. Операторы могут заблокировать пользователя (тогда бот молча игнорирует
+его сообщения) или очистить сообщения ветки. Это независимо от встроенной «Обратной связи» выше —
+канал для тех, кто пишет боту напрямую, а не через приложение.
+
 ### История и статистика
 Завершённые партии архивируются в независимом от словаря виде и экспортируются
 в GCG; экспорт доступен **только после завершения партии** и никогда — для

docs/UI_DESIGN.md

@@ -8,7 +8,13 @@ emoji glyphs. Tokens are CSS custom properties (`ui/src/app.css`), light/dark vi
 `prefers-color-scheme` or an explicit Settings choice, and **Telegram-themed**:
 on a Telegram Mini App launch — the app is served under `/telegram/` and detects the
 launch by `Telegram.WebApp.initData` — the SDK's `themeParams` override the tokens at
-runtime; opened outside Telegram, the `/telegram/` path redirects to the site root.
+runtime; on that path without sign-in data (no `initData` — outside Telegram, or a Mini App
+launch that delivered none, as seen on some Android clients) the app renders a compact,
+shareable launch-diagnostic screen (`screens/TelegramLaunchError.svelte`) rather than
+redirecting to the site root. `telegram-web-app.js` is loaded **dynamically with a timeout**,
+only on a Telegram entry — not a render-blocking `<script>` in the shared `index.html` shell —
+so a network that blocks `telegram.org` cannot hang the page; `/app/` (web) and the native build
+never load it.
 
 ## Layout shell (`components/Screen.svelte`)
 
@@ -91,14 +97,16 @@ dismisses as soon as the lobby is ready. The pure layout and timing live in `lib
   which leaks into the Telegram Desktop webview and otherwise fights it) and the Settings
   theme switcher is hidden; the nav bar takes Telegram's background and `setHeaderColor` /
   `setBackgroundColor` / `setBottomBarColor` paint Telegram's own chrome to match; the
-  native header **BackButton** drives back-navigation (the app's chevron is hidden in
+  app's **own back chevron** (Header) drives back-navigation on every platform — the native
-  Telegram); **HapticFeedback** fires on tile placement / commit / error; on **mobile**
+  Telegram BackButton is not used, as it does not render reliably in the windowed Mini App;
-  clients the app enters **immersive fullscreen** on launch (`requestFullscreen`, Bot API
+  **HapticFeedback** fires on tile placement / commit / error; the app calls `expand()` for the
-  8.0+) like Telegram's own Mini Apps, while desktop keeps the bot's full-size window;
+  bot's full-size (max-height) window but **never `requestFullscreen`** — immersive fullscreen hid
-  **closing confirmation** is enabled while a game is open **on mobile only** (on desktop
+  the native header (and its BackButton) and the Android system swipe-back then minimised the app,
-  closing is deliberate and the "changes may not be saved" dialog is just noise — move drafts
+  so it stays windowed with Telegram's thin native header (close) above the app's own header; move
-  auto-save); **vertical swipes** (swipe-to-minimise)
+  drafts auto-save, so there is **no closing-confirmation guard**; a hidden **debug panel** (ten
-  are disabled so they don't fight tile drag or the board scroll; **external links** (the word-check
+  quick taps on the header title) shows and shares a privacy-safe client diagnostic snapshot for
+  support; **vertical swipes** (swipe-to-minimise) are disabled so they don't fight tile drag or
+  the board scroll; **external links** (the word-check
   dictionary lookup, the rules link, operator-reply links) open through `Telegram.WebApp.openLink`
   so Telegram shows them in its in-app browser instead of the WebView's "open this link?"
   confirmation a plain `target=_blank` triggers; and a live stream dropped

gateway/internal/backendclient/api.go

@@ -184,10 +184,10 @@ type ChatResp struct {
 }
 
 // TelegramAuth provisions/finds the Telegram account and mints a session, seeding a
-// brand-new account's display name and language from the validated launch fields and
+// brand-new account's display name and language from the validated launch fields, its
-// its time zone from browserTz (the client's detected "±HH:MM" UTC offset; first
+// time zone from browserTz (the client's detected "±HH:MM" UTC offset) and, from the
-// contact only).
+// validated launch deep-link startParam, its variant preferences (first contact only).
-func (c *Client) TelegramAuth(ctx context.Context, externalID, languageCode, username, firstName, browserTz string) (SessionResp, error) {
+func (c *Client) TelegramAuth(ctx context.Context, externalID, languageCode, username, firstName, browserTz, startParam string) (SessionResp, error) {
 	var out SessionResp
 	err := c.do(ctx, http.MethodPost, "/api/v1/internal/sessions/telegram", "", "",
 		map[string]string{
@@ -196,6 +196,7 @@ func (c *Client) TelegramAuth(ctx context.Context, externalID, languageCode, use
 			"username":      username,
 			"first_name":    firstName,
 			"browser_tz":    browserTz,
+			"start_param":   startParam,
 		}, &out)
 	return out, err
 }

gateway/internal/transcode/transcode.go

@@ -9,6 +9,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"net/url"
 
 	"scrabble/gateway/internal/backendclient"
 	"scrabble/gateway/internal/connector"
@@ -154,11 +155,19 @@ func DomainCode(err error) (string, bool) {
 func authTelegramHandler(backend *backendclient.Client, tg TelegramValidator) Handler {
 	return func(ctx context.Context, req Request) ([]byte, error) {
 		in := fb.GetRootAsTelegramLoginRequest(req.Payload, 0)
-		user, err := tg.ValidateInitData(ctx, string(in.InitData()))
+		initData := string(in.InitData())
+		user, err := tg.ValidateInitData(ctx, initData)
 		if err != nil {
 			return nil, err
 		}
-		sess, err := backend.TelegramAuth(ctx, user.ExternalID, user.LanguageCode, user.Username, user.FirstName, string(in.BrowserTz()))
+		// start_param rides inside the signed initData validated just above, so the launch
+		// deep-link payload can be trusted here without a separate wire field; the backend
+		// uses it to seed a brand-new account's variant preferences.
+		startParam := ""
+		if q, perr := url.ParseQuery(initData); perr == nil {
+			startParam = q.Get("start_param")
+		}
+		sess, err := backend.TelegramAuth(ctx, user.ExternalID, user.LanguageCode, user.Username, user.FirstName, string(in.BrowserTz()), startParam)
 		if err != nil {
 			return nil, err
 		}

gateway/internal/transcode/transcode_telegram_test.go

@@ -54,7 +54,7 @@ func TestTelegramAuthForwardsSeedFields(t *testing.T) {
 		t.Fatal("auth.telegram not registered")
 	}
 
-	payload, err := op.Handler(context.Background(), transcode.Request{Payload: telegramLoginPayload("init")})
+	payload, err := op.Handler(context.Background(), transcode.Request{Payload: telegramLoginPayload("start_param=verudit_ru-scrabble_en&query_id=abc")})
 	if err != nil {
 		t.Fatalf("handler: %v", err)
 	}
@@ -66,6 +66,11 @@ func TestTelegramAuthForwardsSeedFields(t *testing.T) {
 	if gotBody["external_id"] != "42" || gotBody["language_code"] != "ru" || gotBody["first_name"] != "Иван" {
 		t.Errorf("forwarded body = %+v, want external_id=42 language_code=ru first_name=Иван", gotBody)
 	}
+	// start_param is parsed out of the validated initData and forwarded so the backend can
+	// seed the new account's variant preferences from a promo deep link.
+	if gotBody["start_param"] != "verudit_ru-scrabble_en" {
+		t.Errorf("forwarded start_param = %q, want verudit_ru-scrabble_en", gotBody["start_param"])
+	}
 }
 
 func TestTelegramAuthInvalidInitData(t *testing.T) {

platform/telegram/Dockerfile

@@ -24,6 +24,11 @@ ARG VERSION=dev
 RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags "-X scrabble/pkg/version.Version=${VERSION}" -o /out/validator ./platform/telegram/cmd/validator
 RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags "-X scrabble/pkg/version.Version=${VERSION}" -o /out/bot ./platform/telegram/cmd/bot
 
+# The bot's support relay writes its JSON state under /data. Stage an empty directory
+# owned by the distroless nonroot UID so a fresh named volume mounted there inherits
+# writable ownership (Docker copies the image dir's mode/owner into an empty volume).
+RUN mkdir -p /out/data
+
 # --- validator (home) --------------------------------------------------------
 FROM gcr.io/distroless/static-debian12:nonroot AS validator
 COPY --from=build /out/validator /usr/local/bin/validator
@@ -32,4 +37,5 @@ ENTRYPOINT ["/usr/local/bin/validator"]
 # --- bot (remote) ------------------------------------------------------------
 FROM gcr.io/distroless/static-debian12:nonroot AS bot
 COPY --from=build /out/bot /usr/local/bin/bot
+COPY --from=build --chown=65532:65532 /out/data /data
 ENTRYPOINT ["/usr/local/bin/bot"]

platform/telegram/README.md

@@ -63,13 +63,32 @@ Telegram identity to an account from a browser. Both map a rejection to gRPC
   `getChatMember`, since bots cannot list members). The bot must be an **administrator** there
   with the **"Ban users"** right (the Bot API `can_restrict_members`), and it subscribes to
   `chat_member` updates, which Telegram delivers only to a chat admin.
+- **Support relay (optional).** When `TELEGRAM_SUPPORT_CHAT_ID` names a private **forum
+  supergroup**, the bot runs a direct support channel for users who message it. A user's first
+  non-`/start` message opens a dedicated **forum topic** whose first message is an info card (the
+  name is a tappable profile mention via a `text_mention` entity — which also stops a name starting
+  with `/` from rendering as a command — plus @username, language, premium, id) with a **Block/Unblock** toggle
+  and a **Clear** button; each message is then copied into that topic (`copyMessage`, so any content
+  — text, media, voice, files — carries over). Any **administrator** of the support chat who writes
+  in a user's topic has it copied back to that user; the bot's own posts and non-admins are ignored
+  (the loop guard). **Block** drops a user's incoming messages (the topic stays); **Clear** deletes
+  the relayed messages, keeping the info card; a topic the operators delete is reopened on the next
+  message. State (user→topic map, block list, relayed ids) is a JSON file under
+  `TELEGRAM_SUPPORT_STATE_DIR` on a persistent volume — the bot host has no database. The bot must
+  be an **administrator** in the group with the **manage-topics** and **delete-messages** rights.
+  The relay is bot-local (no backend, no bot-link) and the user gets no automatic reply.
 - **Promo bot (optional).** When `TELEGRAM_PROMO_BOT_TOKEN` is set, the container also
   runs a **second, standalone** bot whose only job is to answer `/start` with a localized
   message and a button that opens the **main** bot's Mini App. The button is a **URL** to
   the main bot's direct link (`TELEGRAM_BOT_LINK`, the same link the UI uses) with
   `?startapp` — a `web_app` button would launch under the promo bot's identity (its token
   would sign the initData), which the main bot's validator rejects. It is fully
-  self-contained: no bot-link, no gateway, no game.
+  self-contained: no bot-link, no gateway, no game. Its `?startapp` payload
+  (`TELEGRAM_PROMO_START_PARAM`, default `verudit_ru-scrabble_en`) is a variant-seed deep
+  link the backend decodes to seed a brand-new user's variant preferences (English Scrabble
+  alongside the default Erudit). The message body also renders the bot's `@username` as that
+  same deep link (an HTML `text_link`), so tapping the mention — not just the button — opens
+  the seeded Mini App rather than the bot profile.
 - **Rate limiting.** Outbound sends are throttled (`TELEGRAM_SEND_RATE_PER_SECOND`,
   default 25) to respect the Bot API flood limits.
 
@@ -132,9 +151,12 @@ Bot (`cmd/bot`):
 | `TELEGRAM_BOTLINK_TLS_CERT` / `_KEY` / `_CA` | — (required) | the bot client cert, its key, and the CA that signs the gateway server cert |
 | `TELEGRAM_GAME_CHANNEL_ID` | — | the bot's game channel chat id for `SendToGameChannel` |
 | `TELEGRAM_CHAT_ID` | — | the moderated discussion chat id (a channel's linked group); empty disables chat gating |
+| `TELEGRAM_SUPPORT_CHAT_ID` | — | the support relay's forum supergroup id (topic per user); empty disables the relay |
+| `TELEGRAM_SUPPORT_STATE_DIR` | `/data` | directory for the support relay's JSON state (a writable volume) |
 | `TELEGRAM_PROMO_BOT_TOKEN` | — | the optional standalone promo bot's token; empty disables it |
 | `TELEGRAM_BOT_USERNAME` | — | the main bot's @username without the @ (promo message); required when the promo bot runs |
 | `TELEGRAM_BOT_LINK` | — | the main bot's Mini App link for the promo button (the UI's `VITE_TELEGRAM_LINK`); required when the promo bot runs |
+| `TELEGRAM_PROMO_START_PARAM` | `verudit_ru-scrabble_en` | the promo button's `startapp` payload — a variant-seed deep link the backend decodes to seed a brand-new user's variant preferences; empty forwards the user's own `/start` payload |
 | `TELEGRAM_OWNS_UPDATES` | `true` | run the exclusive `getUpdates` long-poll (one bot per token) |
 | `TELEGRAM_SEND_RATE_PER_SECOND` | `25` | outbound Bot API send cap (0 disables) |
 | `TELEGRAM_INSTANCE_ID` | hostname | bot identity reported to the gateway |

platform/telegram/cmd/bot/main.go

@@ -10,6 +10,7 @@ import (
 	"context"
 	"log"
 	"os/signal"
+	"path/filepath"
 	"sync"
 	"syscall"
 	"time"
@@ -23,6 +24,7 @@ import (
 	"scrabble/platform/telegram/internal/botlink"
 	"scrabble/platform/telegram/internal/config"
 	"scrabble/platform/telegram/internal/promobot"
+	"scrabble/platform/telegram/internal/support"
 )
 
 // telemetryShutdownTimeout bounds the OpenTelemetry flush during process exit.
@@ -65,6 +67,19 @@ func run(ctx context.Context, cfg config.BotConfig, logger *zap.Logger) error {
 		logger.Warn("telemetry: start runtime metrics", zap.Error(err))
 	}
 
+	// The support relay keeps its per-user state in a JSON file on a writable volume
+	// (the bot host has no database). A corrupt file is logged and the relay starts
+	// empty rather than crash-looping the bot.
+	var supportStore *support.Store
+	if cfg.SupportChatID != 0 {
+		statePath := filepath.Join(cfg.SupportStateDir, "support.json")
+		supportStore, err = support.Open(statePath)
+		if err != nil {
+			logger.Warn("support: state load failed, starting empty", zap.String("path", statePath), zap.Error(err))
+			supportStore = support.New(statePath)
+		}
+	}
+
 	b, err := bot.New(bot.Config{
 		Token:             cfg.Token,
 		APIBaseURL:        cfg.APIBaseURL,
@@ -73,6 +88,8 @@ func run(ctx context.Context, cfg config.BotConfig, logger *zap.Logger) error {
 		SendRatePerSecond: cfg.SendRatePerSecond,
 		ChatID:            cfg.ChatID,
 		GameChannelID:     cfg.GameChannelID,
+		SupportChatID:     cfg.SupportChatID,
+		SupportStore:      supportStore,
 	}, logger)
 	if err != nil {
 		return err
@@ -114,6 +131,7 @@ func run(ctx context.Context, cfg config.BotConfig, logger *zap.Logger) error {
 			TestEnv:           cfg.TestEnv,
 			BotUsername:       cfg.BotUsername,
 			BotLinkURL:        cfg.BotLinkURL,
+			StartParam:        cfg.PromoStartParam,
 			SendRatePerSecond: cfg.SendRatePerSecond,
 		}, logger)
 		if err != nil {
@@ -128,6 +146,7 @@ func run(ctx context.Context, cfg config.BotConfig, logger *zap.Logger) error {
 		zap.Bool("owns_updates", cfg.OwnsUpdates),
 		zap.Bool("test_env", cfg.TestEnv),
 		zap.Bool("chat_gating", cfg.ChatID != 0),
+		zap.Bool("support_relay", cfg.SupportChatID != 0),
 		zap.Bool("promo_bot", promo != nil))
 
 	var wg sync.WaitGroup

platform/telegram/internal/bot/bot.go

@@ -15,6 +15,8 @@ import (
 	"github.com/go-telegram/bot/models"
 	"go.uber.org/zap"
 	"golang.org/x/time/rate"
+
+	"scrabble/platform/telegram/internal/support"
 )
 
 // Config configures the bot wrapper.
@@ -39,6 +41,14 @@ type Config struct {
 	// GameChannelID is the game channel whose public @username the /start welcome links
 	// to (resolved from this id via getChat at startup); 0 omits that follow link.
 	GameChannelID int64
+	// SupportChatID is the private forum supergroup the bot relays direct user messages
+	// into (one topic per user) and reads operator replies from; 0 disables the support
+	// relay. The bot must be an administrator there with the manage-topics and
+	// delete-messages rights.
+	SupportChatID int64
+	// SupportStore persists the support relay's state (topic mapping, block list,
+	// relayed message ids); required when SupportChatID is set, ignored otherwise.
+	SupportStore *support.Store
 }
 
 // EligibilityResolver answers whether the Telegram user identified by externalID
@@ -66,11 +76,21 @@ type Bot struct {
 	channelUsername string
 	chatUsername    string
 	// botID is the bot's own Telegram user id (resolved at startup); it skips the
-	// chat_member updates the bot's own restrict actions generate — the grant loop guard.
+	// chat_member updates the bot's own restrict actions generate — the grant loop guard —
+	// and the bot's own relayed copies in the support chat.
 	botID int64
 	// eligibility resolves a joining user's chat write eligibility; nil leaves a
 	// joiner muted (fail-closed) until it is wired.
 	eligibility EligibilityResolver
+	// supportChatID is the support relay's forum supergroup (0 disables the relay).
+	supportChatID int64
+	// support persists the support relay's per-user state; nil when the relay is off.
+	support *support.Store
+	// supportLocks serialises per-user topic creation so a burst of a new user's
+	// messages opens exactly one topic.
+	supportLocks *keyedMutex
+	// admins caches the support chat's administrator ids (who may reply and act).
+	admins *adminCache
 }
 
 // New builds the bot wrapper, registering the /start handler and a default handler
@@ -80,7 +100,14 @@ func New(cfg Config, log *zap.Logger) (*Bot, error) {
 	if log == nil {
 		log = zap.NewNop()
 	}
-	t := &Bot{miniAppURL: cfg.MiniAppURL, log: log, chatID: cfg.ChatID, channelID: cfg.GameChannelID}
+	t := &Bot{
+		miniAppURL:    cfg.MiniAppURL,
+		log:           log,
+		chatID:        cfg.ChatID,
+		channelID:     cfg.GameChannelID,
+		supportChatID: cfg.SupportChatID,
+		support:       cfg.SupportStore,
+	}
 	if cfg.SendRatePerSecond > 0 {
 		t.limiter = rate.NewLimiter(rate.Limit(cfg.SendRatePerSecond), cfg.SendRatePerSecond)
 	}
@@ -89,15 +116,26 @@ func New(cfg Config, log *zap.Logger) (*Bot, error) {
 		tgbot.WithDefaultHandler(t.handleUpdate),
 		tgbot.WithMessageTextHandler("/start", tgbot.MatchTypePrefix, t.handleStart),
 	}
+	if t.supportEnabled() {
+		t.supportLocks = newKeyedMutex()
+		t.admins = &adminCache{}
+		// The info-card buttons are callback_query updates; route them to the support
+		// callback handler by their "sup:" data prefix.
+		opts = append(opts, tgbot.WithCallbackQueryDataHandler(supportCallbackPrefix, tgbot.MatchTypePrefix, t.handleSupportCallback))
+	}
+	// Allowed updates default to "all except chat_member". Specify an explicit set only
+	// when we need chat_member (moderated chat) — and then re-add callback_query (which
+	// the explicit set would otherwise drop) when the support relay needs it.
 	if cfg.ChatID != 0 {
-		// chat_member updates are off by default; subscribe explicitly (alongside
+		allowed := tgbot.AllowedUpdates{
-		// messages) so the bot sees joins in the moderated chat. The bot must also be an
-		// administrator there for Telegram to deliver them.
-		opts = append(opts, tgbot.WithAllowedUpdates(tgbot.AllowedUpdates{
 			models.AllowedUpdateMessage,
 			models.AllowedUpdateMyChatMember,
 			models.AllowedUpdateChatMember,
-		}))
+		}
+		if t.supportEnabled() {
+			allowed = append(allowed, models.AllowedUpdateCallbackQuery)
+		}
+		opts = append(opts, tgbot.WithAllowedUpdates(allowed))
 	}
 	if cfg.TestEnv {
 		// Route to the Bot API test environment (.../bot<token>/test/METHOD).
@@ -134,6 +172,9 @@ func (t *Bot) Run(ctx context.Context) {
 	if t.chatID != 0 {
 		t.logChatAdminStatus(ctx)
 	}
+	if t.supportEnabled() {
+		t.initSupport(ctx)
+	}
 	t.resolveWelcomeHandles(ctx)
 	t.api.Start(ctx)
 }
@@ -305,6 +346,19 @@ func (t *Bot) handleUpdate(ctx context.Context, api *tgbot.Bot, update *models.U
 		t.handleChatMember(ctx, update.ChatMember)
 		return
 	}
+	// Support relay (when enabled): a non-/start message — /start has its own handler —
+	// is either an operator's reply in the support chat or a user's direct message to
+	// relay. Everything else falls through to the Mini App launch reply.
+	if t.supportEnabled() && update.Message != nil {
+		switch {
+		case update.Message.Chat.ID == t.supportChatID:
+			t.handleSupportGroupMessage(ctx, update.Message)
+			return
+		case update.Message.Chat.Type == models.ChatTypePrivate:
+			t.handleSupportUserMessage(ctx, update.Message)
+			return
+		}
+	}
 	t.handleStart(ctx, api, update)
 }
 

platform/telegram/internal/bot/support.go

@@ -0,0 +1,484 @@
+package bot
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+	"unicode/utf16"
+
+	tgbot "github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
+	"go.uber.org/zap"
+
+	"scrabble/platform/telegram/internal/support"
+)
+
+// Support relay: the bot forwards a user's direct messages into a per-user forum
+// topic in the operators' private support chat, and relays operator replies in that
+// topic back to the user. The info card opening each topic carries a Block/Unblock
+// toggle and a Clear button. State (topic mapping, block list, relayed message ids)
+// lives in a small JSON file via internal/support.
+const (
+	// supportCallbackPrefix namespaces the info-card button callbacks
+	// ("sup:<action>:<userID>").
+	supportCallbackPrefix = "sup:"
+	supportActionBlock    = "block"
+	supportActionUnblock  = "unblock"
+	supportActionClear    = "clear"
+	// supportAdminTTL is how long the support chat's administrator set is cached.
+	supportAdminTTL = time.Minute
+	// supportTopicNameMax bounds the forum topic name (the Telegram limit is 128).
+	supportTopicNameMax = 128
+	// supportDeleteBatch is the maximum message ids per deleteMessages call (the
+	// Telegram limit is 100).
+	supportDeleteBatch = 100
+)
+
+// supportEnabled reports whether the support relay is configured.
+func (t *Bot) supportEnabled() bool {
+	return t.supportChatID != 0 && t.support != nil
+}
+
+// initSupport prepares the support relay at startup: it resolves the bot's own user
+// id (getMe) for the loop guard, unless the chat-gating self-check already did, and
+// logs readiness. The loop guard also tests From.IsBot, so an unresolved id is not
+// fatal.
+func (t *Bot) initSupport(ctx context.Context) {
+	if t.botID == 0 {
+		if me, err := t.api.GetMe(ctx); err != nil {
+			t.log.Warn("support: getMe failed; relying on is_bot for the loop guard", zap.Error(err))
+		} else {
+			t.botID = me.ID
+		}
+	}
+	t.log.Info("support relay ready", zap.Int64("support_chat_id", t.supportChatID))
+}
+
+// keyedMutex serialises work per int64 key (here, per user id) so two concurrent
+// updates from the same user — the go-telegram/bot library runs handlers in
+// goroutines — cannot both open a forum topic.
+type keyedMutex struct {
+	mu sync.Mutex
+	m  map[int64]*sync.Mutex
+}
+
+func newKeyedMutex() *keyedMutex { return &keyedMutex{m: map[int64]*sync.Mutex{}} }
+
+// lock acquires the per-key mutex and returns its unlock function.
+func (k *keyedMutex) lock(key int64) func() {
+	k.mu.Lock()
+	mu, ok := k.m[key]
+	if !ok {
+		mu = &sync.Mutex{}
+		k.m[key] = mu
+	}
+	k.mu.Unlock()
+	mu.Lock()
+	return mu.Unlock
+}
+
+// adminCache caches the support chat's administrator ids for a short TTL, so the bot
+// does not call getChatAdministrators on every operator action.
+type adminCache struct {
+	mu        sync.Mutex
+	ids       map[int64]bool
+	fetchedAt time.Time
+}
+
+// isSupportAdmin reports whether userID administers the support chat, refreshing the
+// cache when stale. On a refresh failure it falls back to the last known set
+// (fail-closed when nothing is cached yet).
+func (t *Bot) isSupportAdmin(ctx context.Context, userID int64) bool {
+	t.admins.mu.Lock()
+	if t.admins.ids != nil && time.Since(t.admins.fetchedAt) < supportAdminTTL {
+		ok := t.admins.ids[userID]
+		t.admins.mu.Unlock()
+		return ok
+	}
+	t.admins.mu.Unlock()
+
+	members, err := t.api.GetChatAdministrators(ctx, &tgbot.GetChatAdministratorsParams{ChatID: t.supportChatID})
+	if err != nil {
+		t.log.Warn("support: getChatAdministrators failed; using cached admin set", zap.Error(err))
+		t.admins.mu.Lock()
+		defer t.admins.mu.Unlock()
+		return t.admins.ids[userID] // a nil map yields false (fail-closed)
+	}
+	ids := make(map[int64]bool, len(members))
+	for _, m := range members {
+		if u := chatMemberUser(m); u != nil {
+			ids[u.ID] = true
+		}
+	}
+	t.admins.mu.Lock()
+	t.admins.ids = ids
+	t.admins.fetchedAt = time.Now()
+	t.admins.mu.Unlock()
+	return ids[userID]
+}
+
+// handleSupportUserMessage relays a user's direct message into their forum topic in
+// the support chat, opening the topic (and its info card) on first contact. A blocked
+// user's message is dropped silently, and the user receives no reply — operators
+// answer from the topic.
+func (t *Bot) handleSupportUserMessage(ctx context.Context, m *models.Message) {
+	if m.From == nil || m.From.IsBot {
+		return
+	}
+	uid := m.From.ID
+	unlock := t.supportLocks.lock(uid)
+	defer unlock()
+
+	rec, _ := t.support.Get(uid)
+	if rec.Blocked {
+		return
+	}
+	topicID, err := t.ensureTopic(ctx, m.From, rec)
+	if err != nil {
+		t.log.Warn("support: ensure topic failed", zap.Int64("user_id", uid), zap.Error(err))
+		return
+	}
+
+	newID, err := t.copyToTopic(ctx, m.Chat.ID, m.ID, topicID)
+	if err != nil && isTopicMissingErr(err) {
+		// Backstop: the topic vanished between the liveness probe and the copy.
+		t.log.Info("support: topic gone on copy, reopening", zap.Int64("user_id", uid), zap.Int("topic_id", topicID))
+		if topicID, err = t.openSupportTopic(ctx, m.From); err == nil {
+			newID, err = t.copyToTopic(ctx, m.Chat.ID, m.ID, topicID)
+		}
+	}
+	if err != nil {
+		t.log.Warn("support: relay to topic failed", zap.Int64("user_id", uid), zap.Error(err))
+		return
+	}
+	if err := t.support.AppendMsg(uid, newID); err != nil {
+		t.log.Warn("support: persist relayed id failed", zap.Int64("user_id", uid), zap.Error(err))
+	}
+}
+
+// handleSupportGroupMessage relays an operator's reply in a user's topic back to that
+// user. It ignores the bot's own posts (the loop guard), messages outside a topic,
+// unknown topics, and non-administrators. The operator's message is tracked too, so a
+// later clear removes it.
+func (t *Bot) handleSupportGroupMessage(ctx context.Context, m *models.Message) {
+	if m.From == nil || m.From.IsBot {
+		return // the bot's own relayed copies (and other bots) — never loop them back
+	}
+	if t.botID != 0 && m.From.ID == t.botID {
+		return
+	}
+	if m.MessageThreadID == 0 {
+		return // the chat's general area, not a user's topic
+	}
+	uid, ok := t.support.ByTopic(m.MessageThreadID)
+	if !ok {
+		return
+	}
+	if !t.isSupportAdmin(ctx, m.From.ID) {
+		return // only operators reach the user
+	}
+	if err := t.support.AppendMsg(uid, m.ID); err != nil {
+		t.log.Warn("support: persist operator msg id failed", zap.Int64("user_id", uid), zap.Error(err))
+	}
+	if _, err := t.copyToUser(ctx, m.ID, uid); err != nil {
+		t.log.Warn("support: relay reply to user failed", zap.Int64("user_id", uid), zap.Error(err))
+	}
+}
+
+// handleSupportCallback handles the info-card buttons (block/unblock/clear). Only
+// support-chat administrators may act; others get a denial. It always answers the
+// callback query so the client's spinner clears.
+func (t *Bot) handleSupportCallback(ctx context.Context, _ *tgbot.Bot, update *models.Update) {
+	cq := update.CallbackQuery
+	if cq == nil {
+		return
+	}
+	action, uid, ok := parseSupportCallback(cq.Data)
+	if !ok {
+		t.answerSupportCallback(ctx, cq.ID, "")
+		return
+	}
+	if !t.isSupportAdmin(ctx, cq.From.ID) {
+		t.answerSupportCallback(ctx, cq.ID, "Недостаточно прав")
+		return
+	}
+	switch action {
+	case supportActionBlock:
+		t.setSupportBlocked(ctx, cq, uid, true)
+	case supportActionUnblock:
+		t.setSupportBlocked(ctx, cq, uid, false)
+	case supportActionClear:
+		t.clearSupportTopic(ctx, cq, uid)
+	default:
+		t.answerSupportCallback(ctx, cq.ID, "")
+	}
+}
+
+// setSupportBlocked sets the user's block state, flips the info-card toggle to match,
+// and answers the callback. Blocking does not delete the topic — it stays.
+func (t *Bot) setSupportBlocked(ctx context.Context, cq *models.CallbackQuery, uid int64, blocked bool) {
+	if err := t.support.SetBlocked(uid, blocked); err != nil {
+		t.log.Warn("support: set blocked failed", zap.Int64("user_id", uid), zap.Error(err))
+		t.answerSupportCallback(ctx, cq.ID, "Ошибка")
+		return
+	}
+	if rec, ok := t.support.Get(uid); ok && rec.HeaderMsgID != 0 {
+		if _, err := t.api.EditMessageReplyMarkup(ctx, &tgbot.EditMessageReplyMarkupParams{
+			ChatID:      t.supportChatID,
+			MessageID:   rec.HeaderMsgID,
+			ReplyMarkup: supportCardMarkup(uid, blocked),
+		}); err != nil {
+			t.log.Debug("support: update card markup failed", zap.Error(err))
+		}
+	}
+	msg := "Разблокирован"
+	if blocked {
+		msg = "Заблокирован"
+	}
+	t.answerSupportCallback(ctx, cq.ID, msg)
+}
+
+// clearSupportTopic deletes the messages relayed into the user's topic (keeping the
+// info card) and answers the callback.
+func (t *Bot) clearSupportTopic(ctx context.Context, cq *models.CallbackQuery, uid int64) {
+	ids, err := t.support.ClearMsgs(uid)
+	if err != nil {
+		t.log.Warn("support: clear failed", zap.Int64("user_id", uid), zap.Error(err))
+		t.answerSupportCallback(ctx, cq.ID, "Ошибка")
+		return
+	}
+	t.deleteSupportMessages(ctx, ids)
+	t.answerSupportCallback(ctx, cq.ID, "Очищено")
+}
+
+// ensureTopic returns a live forum-topic id for the user, opening a fresh topic (and
+// info card) when none exists or the previous one was deleted. Telegram silently
+// routes a copy aimed at a deleted topic into the chat's General topic (no error), so
+// the bot cannot rely on copyMessage failing; instead it probes the info card —
+// re-applying the card's reply markup is a no-op that errors only when the card (hence
+// the topic) is gone — and reopens on that signal. The probe also keeps the card's
+// block button in sync with the stored state.
+func (t *Bot) ensureTopic(ctx context.Context, u *models.User, rec support.User) (int, error) {
+	if rec.TopicID == 0 || rec.HeaderMsgID == 0 {
+		return t.openSupportTopic(ctx, u)
+	}
+	_, err := t.api.EditMessageReplyMarkup(ctx, &tgbot.EditMessageReplyMarkupParams{
+		ChatID:      t.supportChatID,
+		MessageID:   rec.HeaderMsgID,
+		ReplyMarkup: supportCardMarkup(u.ID, rec.Blocked),
+	})
+	if isCardMissingErr(err) {
+		t.log.Info("support: topic gone, reopening", zap.Int64("user_id", u.ID), zap.Int("topic_id", rec.TopicID))
+		return t.openSupportTopic(ctx, u)
+	}
+	// Any other outcome (success, or a benign "message is not modified") means the
+	// topic is alive; reuse it.
+	return rec.TopicID, nil
+}
+
+// openSupportTopic creates a forum topic for the user and posts its info card with
+// the block/clear buttons, persisting both. It returns the new topic id. A failure to
+// persist is logged but not fatal: the in-memory mapping still lets the relay proceed.
+func (t *Bot) openSupportTopic(ctx context.Context, u *models.User) (int, error) {
+	topic, err := t.api.CreateForumTopic(ctx, &tgbot.CreateForumTopicParams{
+		ChatID: t.supportChatID,
+		Name:   supportTopicName(u),
+	})
+	if err != nil {
+		return 0, fmt.Errorf("create forum topic: %w", err)
+	}
+	headerID := 0
+	cardText, cardEntities := supportCard(u)
+	header, err := t.api.SendMessage(ctx, &tgbot.SendMessageParams{
+		ChatID:          t.supportChatID,
+		MessageThreadID: topic.MessageThreadID,
+		Text:            cardText,
+		Entities:        cardEntities,
+		ReplyMarkup:     supportCardMarkup(u.ID, false),
+	})
+	if err != nil {
+		t.log.Warn("support: post info card failed (topic opened without it)", zap.Error(err))
+	} else {
+		headerID = header.ID
+	}
+	if err := t.support.SetTopic(u.ID, topic.MessageThreadID, headerID, u.FirstName, u.LastName, u.Username); err != nil {
+		t.log.Warn("support: persist topic state failed (kept in memory)", zap.Int64("user_id", u.ID), zap.Error(err))
+	}
+	return topic.MessageThreadID, nil
+}
+
+// copyToTopic copies a message into the user's forum topic and returns the new
+// message id.
+func (t *Bot) copyToTopic(ctx context.Context, fromChatID int64, messageID, topicID int) (int, error) {
+	if err := t.throttle(ctx); err != nil {
+		return 0, err
+	}
+	res, err := t.api.CopyMessage(ctx, &tgbot.CopyMessageParams{
+		ChatID:          t.supportChatID,
+		MessageThreadID: topicID,
+		FromChatID:      fromChatID,
+		MessageID:       messageID,
+	})
+	if err != nil {
+		return 0, err
+	}
+	return res.ID, nil
+}
+
+// copyToUser copies a support-chat message to the user's private chat and returns the
+// new message id.
+func (t *Bot) copyToUser(ctx context.Context, messageID int, userID int64) (int, error) {
+	if err := t.throttle(ctx); err != nil {
+		return 0, err
+	}
+	res, err := t.api.CopyMessage(ctx, &tgbot.CopyMessageParams{
+		ChatID:     userID,
+		FromChatID: t.supportChatID,
+		MessageID:  messageID,
+	})
+	if err != nil {
+		return 0, err
+	}
+	return res.ID, nil
+}
+
+// deleteSupportMessages best-effort deletes the given support-chat messages in
+// batches; individual failures (for example a message already removed) are ignored.
+func (t *Bot) deleteSupportMessages(ctx context.Context, ids []int) {
+	for start := 0; start < len(ids); start += supportDeleteBatch {
+		end := min(start+supportDeleteBatch, len(ids))
+		if _, err := t.api.DeleteMessages(ctx, &tgbot.DeleteMessagesParams{
+			ChatID:     t.supportChatID,
+			MessageIDs: ids[start:end],
+		}); err != nil {
+			t.log.Debug("support: delete batch failed", zap.Error(err))
+		}
+	}
+}
+
+// answerSupportCallback answers a callback query, logging a failure at debug (the
+// only effect of a miss is a lingering client spinner).
+func (t *Bot) answerSupportCallback(ctx context.Context, id, text string) {
+	if _, err := t.api.AnswerCallbackQuery(ctx, &tgbot.AnswerCallbackQueryParams{
+		CallbackQueryID: id,
+		Text:            text,
+	}); err != nil {
+		t.log.Debug("support: answer callback failed", zap.Error(err))
+	}
+}
+
+// parseSupportCallback parses "sup:<action>:<userID>" callback data.
+func parseSupportCallback(data string) (action string, userID int64, ok bool) {
+	rest, found := strings.CutPrefix(data, supportCallbackPrefix)
+	if !found {
+		return "", 0, false
+	}
+	action, idStr, found := strings.Cut(rest, ":")
+	if !found {
+		return "", 0, false
+	}
+	userID, err := strconv.ParseInt(idStr, 10, 64)
+	if err != nil {
+		return "", 0, false
+	}
+	return action, userID, true
+}
+
+// supportCardMarkup builds the info-card buttons: a Block/Unblock toggle reflecting
+// the current state, and a Clear button.
+func supportCardMarkup(userID int64, blocked bool) *models.InlineKeyboardMarkup {
+	toggleText, toggleAction := "Заблокировать", supportActionBlock
+	if blocked {
+		toggleText, toggleAction = "Разблокировать", supportActionUnblock
+	}
+	return &models.InlineKeyboardMarkup{
+		InlineKeyboard: [][]models.InlineKeyboardButton{{
+			{Text: toggleText, CallbackData: fmt.Sprintf("%s%s:%d", supportCallbackPrefix, toggleAction, userID)},
+			{Text: "Очистить", CallbackData: fmt.Sprintf("%s%s:%d", supportCallbackPrefix, supportActionClear, userID)},
+		}},
+	}
+}
+
+// supportTopicName builds the forum topic title for a user: full name and @username,
+// trimmed to the Telegram length limit.
+func supportTopicName(u *models.User) string {
+	name := strings.TrimSpace(u.FirstName + " " + u.LastName)
+	if name == "" {
+		name = "user " + strconv.FormatInt(u.ID, 10)
+	}
+	if u.Username != "" {
+		name += " @" + u.Username
+	}
+	if r := []rune(name); len(r) > supportTopicNameMax {
+		return string(r[:supportTopicNameMax])
+	}
+	return name
+}
+
+// supportCard renders the topic info card describing the user and the message
+// entities for it. The display name is covered by a text_mention entity: it links to
+// the user's profile (the reliable way to mention a user who has no public username —
+// the bot has seen them, since they messaged it) and, because the name sits inside an
+// entity, Telegram does not auto-detect a leading "/" as a bot command or a stray
+// "@handle" inside the name as a mention. The remaining lines are plain text; a public
+// @username, when present, is left for Telegram to auto-link. Entity offsets are in
+// UTF-16 code units, as the Bot API requires; the name is at offset 0.
+func supportCard(u *models.User) (string, []models.MessageEntity) {
+	name := strings.TrimSpace(u.FirstName + " " + u.LastName)
+	if name == "" {
+		name = "user " + strconv.FormatInt(u.ID, 10)
+	}
+	username := "—"
+	if u.Username != "" {
+		username = "@" + u.Username
+	}
+	lang := u.LanguageCode
+	if lang == "" {
+		lang = "—"
+	}
+	premium := "нет"
+	if u.IsPremium {
+		premium = "да"
+	}
+	var b strings.Builder
+	b.WriteString(name)
+	fmt.Fprintf(&b, "\nUsername: %s", username)
+	fmt.Fprintf(&b, "\nID: %d", u.ID)
+	fmt.Fprintf(&b, "\nЯзык: %s · Premium: %s", lang, premium)
+	entities := []models.MessageEntity{{
+		Type:   models.MessageEntityTypeTextMention,
+		Offset: 0,
+		Length: len(utf16.Encode([]rune(name))),
+		User:   &models.User{ID: u.ID},
+	}}
+	return b.String(), entities
+}
+
+// isCardMissingErr reports whether err means the info-card message no longer exists
+// (the operators deleted the topic), as opposed to a benign "message is not modified"
+// no-op when the card is still there.
+func isCardMissingErr(err error) bool {
+	if err == nil {
+		return false
+	}
+	s := strings.ToLower(err.Error())
+	return strings.Contains(s, "message to edit not found") ||
+		strings.Contains(s, "message can't be edited") ||
+		strings.Contains(s, "message_id_invalid")
+}
+
+// isTopicMissingErr reports whether err is Telegram's deleted/absent forum-topic
+// error, signalling the topic must be reopened.
+func isTopicMissingErr(err error) bool {
+	if err == nil {
+		return false
+	}
+	s := strings.ToLower(err.Error())
+	return strings.Contains(s, "thread not found") ||
+		strings.Contains(s, "thread_not_found") ||
+		strings.Contains(s, "topic deleted") ||
+		strings.Contains(s, "topic_deleted")
+}

platform/telegram/internal/bot/support_test.go

@@ -0,0 +1,473 @@
+package bot
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/go-telegram/bot/models"
+	"go.uber.org/zap"
+
+	"scrabble/platform/telegram/internal/support"
+)
+
+const supportChatID = -1001000000000
+
+// copyRec records one copyMessage call.
+type copyRec struct {
+	chatID, fromChatID, threadID, messageID string
+}
+
+// supportAPI is a fake Bot API for the support-relay handlers: it answers the
+// methods they call with incrementing ids and records the requests for assertions.
+type supportAPI struct {
+	mu           sync.Mutex
+	adminIDs     []int64
+	nextThread   int
+	nextMsg      int
+	topicsOpened int
+	copies       []copyRec
+	headerThread string // message_thread_id of the last header sendMessage
+	deleted      [][]int
+	editedMsgIDs []string
+	answers      []string
+	// editErr, when set, makes editMessageReplyMarkup return that Telegram error
+	// description (simulating a deleted info card / topic).
+	editErr string
+}
+
+func newSupportAPI(adminIDs ...int64) *supportAPI {
+	return &supportAPI{adminIDs: adminIDs, nextThread: 1000, nextMsg: 5000}
+}
+
+func (s *supportAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	path := r.URL.Path
+	switch {
+	case strings.HasSuffix(path, "/getMe"):
+		io.WriteString(w, `{"ok":true,"result":{"id":1,"is_bot":true,"first_name":"bot","username":"b"}}`)
+	case strings.HasSuffix(path, "/createForumTopic"):
+		s.topicsOpened++
+		tid := s.nextThread
+		s.nextThread++
+		fmt.Fprintf(w, `{"ok":true,"result":{"message_thread_id":%d,"name":%q}}`, tid, r.FormValue("name"))
+	case strings.HasSuffix(path, "/sendMessage"):
+		s.headerThread = r.FormValue("message_thread_id")
+		mid := s.nextMsg
+		s.nextMsg++
+		fmt.Fprintf(w, `{"ok":true,"result":{"message_id":%d}}`, mid)
+	case strings.HasSuffix(path, "/copyMessage"):
+		s.copies = append(s.copies, copyRec{
+			chatID:     r.FormValue("chat_id"),
+			fromChatID: r.FormValue("from_chat_id"),
+			threadID:   r.FormValue("message_thread_id"),
+			messageID:  r.FormValue("message_id"),
+		})
+		mid := s.nextMsg
+		s.nextMsg++
+		fmt.Fprintf(w, `{"ok":true,"result":{"message_id":%d}}`, mid)
+	case strings.HasSuffix(path, "/deleteMessages"):
+		var ids []int
+		_ = json.Unmarshal([]byte(r.FormValue("message_ids")), &ids)
+		s.deleted = append(s.deleted, ids)
+		io.WriteString(w, `{"ok":true,"result":true}`)
+	case strings.HasSuffix(path, "/editMessageReplyMarkup"):
+		if s.editErr != "" {
+			fmt.Fprintf(w, `{"ok":false,"error_code":400,"description":%q}`, s.editErr)
+			return
+		}
+		s.editedMsgIDs = append(s.editedMsgIDs, r.FormValue("message_id"))
+		io.WriteString(w, `{"ok":true,"result":{"message_id":1}}`)
+	case strings.HasSuffix(path, "/answerCallbackQuery"):
+		s.answers = append(s.answers, r.FormValue("text"))
+		io.WriteString(w, `{"ok":true,"result":true}`)
+	case strings.HasSuffix(path, "/getChatAdministrators"):
+		var b strings.Builder
+		b.WriteString(`{"ok":true,"result":[`)
+		for i, id := range s.adminIDs {
+			if i > 0 {
+				b.WriteString(",")
+			}
+			fmt.Fprintf(&b, `{"status":"administrator","user":{"id":%d,"is_bot":false}}`, id)
+		}
+		b.WriteString(`]}`)
+		io.WriteString(w, b.String())
+	default:
+		io.WriteString(w, `{"ok":true,"result":true}`)
+	}
+}
+
+func (s *supportAPI) copyCount() int {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return len(s.copies)
+}
+
+// newSupportBot builds a support-enabled bot against the fake API and returns it with
+// its backing store.
+func newSupportBot(t *testing.T, api http.Handler) (*Bot, *support.Store) {
+	t.Helper()
+	srv := httptest.NewServer(api)
+	t.Cleanup(srv.Close)
+	st := support.New(filepath.Join(t.TempDir(), "support.json"))
+	b, err := New(Config{
+		Token:         "123:ABC",
+		APIBaseURL:    srv.URL,
+		MiniAppURL:    "https://example.com/telegram/",
+		SupportChatID: supportChatID,
+		SupportStore:  st,
+	}, zap.NewNop())
+	if err != nil {
+		t.Fatalf("new support bot: %v", err)
+	}
+	return b, st
+}
+
+// userMsg builds a private direct message from the given user.
+func userMsg(userID int64, text string) *models.Message {
+	return &models.Message{
+		ID:   int(userID)*10 + 1,
+		Chat: models.Chat{ID: userID, Type: models.ChatTypePrivate},
+		From: &models.User{ID: userID, FirstName: "Ann", Username: "annlee", LanguageCode: "ru"},
+		Text: text,
+	}
+}
+
+func TestSupportFirstContactOpensTopicAndRelays(t *testing.T) {
+	api := newSupportAPI()
+	b, st := newSupportBot(t, api)
+
+	b.handleSupportUserMessage(context.Background(), userMsg(7, "hello"))
+
+	if api.topicsOpened != 1 {
+		t.Fatalf("topics opened = %d, want 1", api.topicsOpened)
+	}
+	rec, ok := st.Get(7)
+	if !ok || rec.TopicID != 1000 || rec.HeaderMsgID != 5000 {
+		t.Fatalf("store = %+v ok=%v, want topic 1000 / header 5000", rec, ok)
+	}
+	if api.headerThread != "1000" {
+		t.Errorf("header posted to thread %q, want 1000", api.headerThread)
+	}
+	if len(api.copies) != 1 {
+		t.Fatalf("copies = %d, want 1", len(api.copies))
+	}
+	c := api.copies[0]
+	if c.threadID != "1000" || c.fromChatID != "7" || c.chatID != fmt.Sprint(supportChatID) {
+		t.Errorf("copy = %+v, want thread 1000 from 7 into the support chat", c)
+	}
+	if len(rec.RelayedMsgIDs) != 1 {
+		t.Errorf("relayed ids = %v, want 1 tracked", rec.RelayedMsgIDs)
+	}
+}
+
+func TestSupportSubsequentReusesTopic(t *testing.T) {
+	api := newSupportAPI()
+	b, st := newSupportBot(t, api)
+
+	b.handleSupportUserMessage(context.Background(), userMsg(7, "first"))
+	b.handleSupportUserMessage(context.Background(), userMsg(7, "second"))
+
+	if api.topicsOpened != 1 {
+		t.Errorf("topics opened = %d, want 1 (topic reused)", api.topicsOpened)
+	}
+	if len(api.copies) != 2 {
+		t.Errorf("copies = %d, want 2", len(api.copies))
+	}
+	rec, _ := st.Get(7)
+	if len(rec.RelayedMsgIDs) != 2 {
+		t.Errorf("relayed ids = %v, want 2", rec.RelayedMsgIDs)
+	}
+}
+
+// TestSupportTopicRecreatedWhenDeleted covers the case the operator hit in prod:
+// after they delete a user's whole topic, Telegram routes a copy aimed at it into
+// General with no error, so the bot must proactively detect the dead topic (the card
+// probe fails) and reopen it instead of silently losing the message to General.
+func TestSupportTopicRecreatedWhenDeleted(t *testing.T) {
+	api := newSupportAPI()
+	api.editErr = "message to edit not found" // the operators deleted the topic + its card
+	b, st := newSupportBot(t, api)
+	// Seed a topic that has since been deleted in Telegram.
+	if err := st.SetTopic(7, 999, 4999, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+
+	b.handleSupportUserMessage(context.Background(), userMsg(7, "still there?"))
+
+	if api.topicsOpened != 1 {
+		t.Fatalf("topics opened = %d, want 1 (reopened after deletion)", api.topicsOpened)
+	}
+	rec, _ := st.Get(7)
+	if rec.TopicID != 1000 || rec.HeaderMsgID != 5000 {
+		t.Errorf("store = topic %d / header %d, want the reopened 1000 / 5000", rec.TopicID, rec.HeaderMsgID)
+	}
+	if len(api.copies) != 1 || api.copies[0].threadID != "1000" {
+		t.Errorf("relay copies = %+v, want one into the reopened topic 1000", api.copies)
+	}
+	if _, ok := st.ByTopic(999); ok {
+		t.Error("stale topic 999 still indexed after reopen")
+	}
+}
+
+func TestSupportBlockedUserDropped(t *testing.T) {
+	api := newSupportAPI()
+	b, st := newSupportBot(t, api)
+	if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+	if err := st.SetBlocked(7, true); err != nil {
+		t.Fatalf("block: %v", err)
+	}
+
+	b.handleSupportUserMessage(context.Background(), userMsg(7, "hello?"))
+
+	if api.copyCount() != 0 {
+		t.Errorf("a blocked user's message was relayed (%d copies)", api.copyCount())
+	}
+	if api.topicsOpened != 0 {
+		t.Errorf("a blocked user opened a topic (%d)", api.topicsOpened)
+	}
+}
+
+// supportGroupMsg builds an operator message inside a topic of the support chat.
+func supportGroupMsg(fromID int64, threadID int, isBot bool) *models.Message {
+	return &models.Message{
+		ID:              700 + threadID,
+		Chat:            models.Chat{ID: supportChatID, Type: models.ChatTypeSupergroup},
+		From:            &models.User{ID: fromID, IsBot: isBot},
+		MessageThreadID: threadID,
+		Text:            "operator reply",
+	}
+}
+
+func TestSupportOperatorReplyRelayed(t *testing.T) {
+	api := newSupportAPI(50) // user 50 is an admin
+	b, st := newSupportBot(t, api)
+	if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+
+	b.handleSupportGroupMessage(context.Background(), supportGroupMsg(50, 1000, false))
+
+	if len(api.copies) != 1 {
+		t.Fatalf("copies = %d, want 1 (reply relayed to user)", len(api.copies))
+	}
+	if api.copies[0].chatID != "7" || api.copies[0].fromChatID != fmt.Sprint(supportChatID) {
+		t.Errorf("copy = %+v, want from the support chat to user 7", api.copies[0])
+	}
+	rec, _ := st.Get(7)
+	if len(rec.RelayedMsgIDs) != 1 {
+		t.Errorf("operator message not tracked for clear: %v", rec.RelayedMsgIDs)
+	}
+}
+
+func TestSupportGroupMessageIgnored(t *testing.T) {
+	cases := []struct {
+		name   string
+		msg    *models.Message
+		admins []int64
+	}{
+		{"bot's own copy (loop guard)", supportGroupMsg(1, 1000, true), []int64{50}},
+		{"non-admin sender", supportGroupMsg(999, 1000, false), []int64{50}},
+		{"outside any topic", supportGroupMsg(50, 0, false), []int64{50}},
+		{"unknown topic", supportGroupMsg(50, 4242, false), []int64{50}},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			api := newSupportAPI(tc.admins...)
+			b, st := newSupportBot(t, api)
+			if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+				t.Fatalf("seed topic: %v", err)
+			}
+			b.handleSupportGroupMessage(context.Background(), tc.msg)
+			if api.copyCount() != 0 {
+				t.Errorf("message relayed (%d copies); it should be ignored", api.copyCount())
+			}
+		})
+	}
+}
+
+// supportCallback builds a callback-query update for the given data and presser.
+func supportCallback(data string, fromID int64) *models.Update {
+	return &models.Update{CallbackQuery: &models.CallbackQuery{
+		ID:   "cb1",
+		From: models.User{ID: fromID},
+		Data: data,
+	}}
+}
+
+func TestSupportCallbackBlockToggle(t *testing.T) {
+	api := newSupportAPI(50)
+	b, st := newSupportBot(t, api)
+	if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+
+	b.handleSupportCallback(context.Background(), b.api, supportCallback("sup:block:7", 50))
+	if !st.Blocked(7) {
+		t.Error("user not blocked after sup:block")
+	}
+	if len(api.editedMsgIDs) != 1 || api.editedMsgIDs[0] != "5000" {
+		t.Errorf("edited markup msg ids = %v, want [5000]", api.editedMsgIDs)
+	}
+
+	b.handleSupportCallback(context.Background(), b.api, supportCallback("sup:unblock:7", 50))
+	if st.Blocked(7) {
+		t.Error("user still blocked after sup:unblock")
+	}
+	if len(api.answers) != 2 || api.answers[0] != "Заблокирован" || api.answers[1] != "Разблокирован" {
+		t.Errorf("answers = %v, want [Заблокирован Разблокирован]", api.answers)
+	}
+}
+
+func TestSupportCallbackNonAdminDenied(t *testing.T) {
+	api := newSupportAPI(50)
+	b, st := newSupportBot(t, api)
+	if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+
+	b.handleSupportCallback(context.Background(), b.api, supportCallback("sup:block:7", 999))
+
+	if st.Blocked(7) {
+		t.Error("a non-admin managed to block the user")
+	}
+	if len(api.answers) != 1 || api.answers[0] != "Недостаточно прав" {
+		t.Errorf("answers = %v, want a permission denial", api.answers)
+	}
+}
+
+func TestSupportCallbackClearDeletesTracked(t *testing.T) {
+	api := newSupportAPI(50)
+	b, st := newSupportBot(t, api)
+	if err := st.SetTopic(7, 1000, 5000, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("seed topic: %v", err)
+	}
+	for _, id := range []int{501, 502, 503} {
+		if err := st.AppendMsg(7, id); err != nil {
+			t.Fatalf("append: %v", err)
+		}
+	}
+
+	b.handleSupportCallback(context.Background(), b.api, supportCallback("sup:clear:7", 50))
+
+	if len(api.deleted) != 1 || len(api.deleted[0]) != 3 {
+		t.Fatalf("deleted batches = %v, want one batch of 3", api.deleted)
+	}
+	rec, _ := st.Get(7)
+	if len(rec.RelayedMsgIDs) != 0 {
+		t.Errorf("relayed ids after clear = %v, want empty", rec.RelayedMsgIDs)
+	}
+	if rec.HeaderMsgID != 5000 {
+		t.Errorf("clear disturbed the header (%d)", rec.HeaderMsgID)
+	}
+}
+
+func TestParseSupportCallback(t *testing.T) {
+	cases := []struct {
+		data       string
+		wantAction string
+		wantUID    int64
+		wantOK     bool
+	}{
+		{"sup:block:7", "block", 7, true},
+		{"sup:clear:-100", "clear", -100, true},
+		{"sup:unblock:42", "unblock", 42, true},
+		{"block:7", "", 0, false},
+		{"sup:block", "", 0, false},
+		{"sup:block:notanumber", "", 0, false},
+	}
+	for _, tc := range cases {
+		t.Run(tc.data, func(t *testing.T) {
+			action, uid, ok := parseSupportCallback(tc.data)
+			if action != tc.wantAction || uid != tc.wantUID || ok != tc.wantOK {
+				t.Errorf("parseSupportCallback(%q) = %q,%d,%v; want %q,%d,%v",
+					tc.data, action, uid, ok, tc.wantAction, tc.wantUID, tc.wantOK)
+			}
+		})
+	}
+}
+
+func TestSupportCard(t *testing.T) {
+	t.Run("name is a plain-text mention, not a command", func(t *testing.T) {
+		u := &models.User{ID: 7, FirstName: "/start", Username: "ann", LanguageCode: "ru", IsPremium: true}
+		text, ents := supportCard(u)
+		// The name is rendered verbatim (no HTML, no escaping) at the start of the card.
+		if !strings.HasPrefix(text, "/start\n") {
+			t.Errorf("card = %q, want it to start with the raw name", text)
+		}
+		// A text_mention entity covers exactly the name with the user id — this both
+		// suppresses the "/start" command auto-detection and links the profile.
+		if len(ents) != 1 {
+			t.Fatalf("entities = %d, want 1", len(ents))
+		}
+		e := ents[0]
+		if e.Type != models.MessageEntityTypeTextMention || e.Offset != 0 || e.Length != len("/start") {
+			t.Errorf("entity = %+v, want a text_mention over the name", e)
+		}
+		if e.User == nil || e.User.ID != 7 {
+			t.Errorf("entity user = %+v, want id 7", e.User)
+		}
+		if strings.Contains(text, "tg://") || strings.Contains(text, "<") {
+			t.Errorf("card = %q, want no tg:// link and no HTML", text)
+		}
+		if !strings.Contains(text, "Premium: да") || !strings.Contains(text, "@ann") {
+			t.Errorf("card = %q, want premium + @username", text)
+		}
+	})
+
+	t.Run("entity length is UTF-16, not runes", func(t *testing.T) {
+		// "😀A" is 2 runes but 3 UTF-16 code units (the emoji is a surrogate pair).
+		u := &models.User{ID: 9, FirstName: "😀A"}
+		_, ents := supportCard(u)
+		if len(ents) != 1 || ents[0].Length != 3 {
+			t.Fatalf("entity = %+v, want length 3 UTF-16 units", ents)
+		}
+	})
+
+	t.Run("nameless user falls back to an id label", func(t *testing.T) {
+		u := &models.User{ID: 42}
+		text, ents := supportCard(u)
+		if !strings.HasPrefix(text, "user 42") {
+			t.Errorf("card = %q, want the id fallback name", text)
+		}
+		if ents[0].Length != len("user 42") {
+			t.Errorf("entity length = %d, want it over the fallback name", ents[0].Length)
+		}
+	})
+}
+
+func TestSupportTopicName(t *testing.T) {
+	if got := supportTopicName(&models.User{ID: 7, FirstName: "Ann", LastName: "Lee", Username: "annlee"}); got != "Ann Lee @annlee" {
+		t.Errorf("topic name = %q, want %q", got, "Ann Lee @annlee")
+	}
+	if got := supportTopicName(&models.User{ID: 7}); got != "user 7" {
+		t.Errorf("nameless topic = %q, want %q", got, "user 7")
+	}
+	long := strings.Repeat("x", 200)
+	if got := supportTopicName(&models.User{ID: 7, FirstName: long}); len([]rune(got)) != supportTopicNameMax {
+		t.Errorf("topic name length = %d, want %d (trimmed)", len([]rune(got)), supportTopicNameMax)
+	}
+}
+
+func TestSupportDisabledFallsThrough(t *testing.T) {
+	// With no SupportChatID the relay is off and supportEnabled is false.
+	srv := httptest.NewServer(&supportAPI{nextThread: 1000, nextMsg: 5000})
+	t.Cleanup(srv.Close)
+	b, err := New(Config{Token: "123:ABC", APIBaseURL: srv.URL, MiniAppURL: "https://example.com/"}, zap.NewNop())
+	if err != nil {
+		t.Fatalf("new bot: %v", err)
+	}
+	if b.supportEnabled() {
+		t.Error("supportEnabled() = true without a SupportChatID")
+	}
+}

platform/telegram/internal/config/config.go

@@ -42,6 +42,16 @@ type BotConfig struct {
 	// (TELEGRAM_CHAT_ID, optional; 0 disables chat gating). The bot must be an admin
 	// there with the "Ban users" right, and "chat_member" in its allowed updates.
 	ChatID int64
+	// SupportChatID is the chat id of the private forum supergroup the bot relays
+	// direct user messages into — one forum topic per user — and reads operator
+	// replies from (TELEGRAM_SUPPORT_CHAT_ID, optional; 0 disables the support relay).
+	// The bot must be an administrator there with the manage-topics and
+	// delete-messages rights. Distinct from ChatID (the moderated discussion chat).
+	SupportChatID int64
+	// SupportStateDir is the directory holding the support relay's JSON state file
+	// (TELEGRAM_SUPPORT_STATE_DIR, default /data). It must be writable by the
+	// container user (UID 65532) and backed by a persistent volume.
+	SupportStateDir string
 	// PromoBotToken is the API token of the optional standalone promo bot run in this
 	// container — a second bot whose only job is to answer /start with a button that
 	// opens the main bot's Mini App (TELEGRAM_PROMO_BOT_TOKEN, optional; empty disables
@@ -55,6 +65,12 @@ type BotConfig struct {
 	// button appends ?startapp=<payload> to it (TELEGRAM_BOT_LINK; required when the
 	// promo bot runs). It is distinct from the BotLink mTLS dial config below.
 	BotLinkURL string
+	// PromoStartParam is the promo button's launch payload, appended as
+	// ?startapp=<PromoStartParam> (TELEGRAM_PROMO_START_PARAM, default
+	// "verudit_ru-scrabble_en"). It is a variant-seed deep link the backend decodes to
+	// seed a brand-new user's variant preferences; its labels must match the backend's
+	// known variants. Empty falls back to forwarding the user's own /start payload.
+	PromoStartParam string
 	// MiniAppURL is the HTTPS origin of the Mini App registered with BotFather; it is
 	// the base of every launch button (TELEGRAM_MINIAPP_URL, required).
 	MiniAppURL string
@@ -103,6 +119,10 @@ const (
 	defaultValidatorGRPCAddr = ":9091"
 	defaultBotReconnectDelay = 2 * time.Second
 	defaultSendRatePerSecond = 25
+	// defaultPromoStartParam is the promo button's default launch payload: a variant-seed
+	// deep link the backend decodes to add English Scrabble to a brand-new user's variant
+	// preferences alongside the default Erudit. Override with TELEGRAM_PROMO_START_PARAM.
+	defaultPromoStartParam = "verudit_ru-scrabble_en"
 )
 
 // LoadValidator reads the validator configuration from the environment.
@@ -135,6 +155,8 @@ func LoadBot() (BotConfig, error) {
 		PromoBotToken:     os.Getenv("TELEGRAM_PROMO_BOT_TOKEN"),
 		BotUsername:       strings.TrimPrefix(os.Getenv("TELEGRAM_BOT_USERNAME"), "@"),
 		BotLinkURL:        os.Getenv("TELEGRAM_BOT_LINK"),
+		PromoStartParam:   envOr("TELEGRAM_PROMO_START_PARAM", defaultPromoStartParam),
+		SupportStateDir:   envOr("TELEGRAM_SUPPORT_STATE_DIR", "/data"),
 		LogLevel:          envOr("TELEGRAM_LOG_LEVEL", "info"),
 		BotLink: BotLinkClientConfig{
 			GatewayAddr: os.Getenv("TELEGRAM_GATEWAY_ADDR"),
@@ -152,6 +174,9 @@ func LoadBot() (BotConfig, error) {
 	if cfg.ChatID, err = envInt64("TELEGRAM_CHAT_ID", 0); err != nil {
 		return BotConfig{}, err
 	}
+	if cfg.SupportChatID, err = envInt64("TELEGRAM_SUPPORT_CHAT_ID", 0); err != nil {
+		return BotConfig{}, err
+	}
 	if cfg.SendRatePerSecond, err = envInt("TELEGRAM_SEND_RATE_PER_SECOND", defaultSendRatePerSecond); err != nil {
 		return BotConfig{}, err
 	}

platform/telegram/internal/config/config_test.go

@@ -151,6 +151,48 @@ func TestLoadBotChatAndPromo(t *testing.T) {
 	})
 }
 
+// TestLoadBotSupportRelay verifies the support-relay chat id parses, the state
+// directory defaults to /data, and the relay is disabled (chat id 0) by default.
+func TestLoadBotSupportRelay(t *testing.T) {
+	t.Run("parsed", func(t *testing.T) {
+		setBotRequired(t)
+		t.Setenv("TELEGRAM_SUPPORT_CHAT_ID", "-1001234567890")
+		t.Setenv("TELEGRAM_SUPPORT_STATE_DIR", "/srv/state")
+		c, err := LoadBot()
+		if err != nil {
+			t.Fatalf("LoadBot: %v", err)
+		}
+		if c.SupportChatID != -1001234567890 {
+			t.Errorf("SupportChatID = %d, want -1001234567890", c.SupportChatID)
+		}
+		if c.SupportStateDir != "/srv/state" {
+			t.Errorf("SupportStateDir = %q, want /srv/state", c.SupportStateDir)
+		}
+	})
+
+	t.Run("defaults", func(t *testing.T) {
+		setBotRequired(t)
+		c, err := LoadBot()
+		if err != nil {
+			t.Fatalf("LoadBot: %v", err)
+		}
+		if c.SupportChatID != 0 {
+			t.Errorf("SupportChatID = %d, want 0 (relay disabled)", c.SupportChatID)
+		}
+		if c.SupportStateDir != "/data" {
+			t.Errorf("SupportStateDir = %q, want /data", c.SupportStateDir)
+		}
+	})
+
+	t.Run("malformed chat id rejected", func(t *testing.T) {
+		setBotRequired(t)
+		t.Setenv("TELEGRAM_SUPPORT_CHAT_ID", "not-a-number")
+		if _, err := LoadBot(); err == nil {
+			t.Fatal("LoadBot: expected an error for a malformed support chat id, got nil")
+		}
+	})
+}
+
 // TestLoadRejectsUnsupportedExporter verifies an exporter outside the supported set
 // fails validation (the validator path).
 func TestLoadRejectsUnsupportedExporter(t *testing.T) {

platform/telegram/internal/promobot/promobot.go

@@ -9,7 +9,9 @@
 package promobot
 
 import (
+	"cmp"
 	"context"
+	"html"
 	"net/url"
 	"strings"
 
@@ -33,6 +35,11 @@ type Config struct {
 	// BotLinkURL is the main bot's Mini App direct link; the button appends
 	// ?startapp=<payload> to it.
 	BotLinkURL string
+	// StartParam is the campaign payload appended as ?startapp=<StartParam> to the launch
+	// button — e.g. a variant-seed deep link ("verudit_ru-scrabble_en") the backend
+	// decodes to seed a brand-new user's variant preferences. Empty falls back to
+	// forwarding the user's own /start payload.
+	StartParam string
 	// SendRatePerSecond caps outbound sends to respect the Bot API flood limits; 0
 	// disables the limiter. The burst equals the per-second rate.
 	SendRatePerSecond int
@@ -43,6 +50,7 @@ type Bot struct {
 	api        *tgbot.Bot
 	username   string
 	linkURL    string
+	startParam string
 	log        *zap.Logger
 	limiter    *rate.Limiter
 }
@@ -53,7 +61,7 @@ func New(cfg Config, log *zap.Logger) (*Bot, error) {
 	if log == nil {
 		log = zap.NewNop()
 	}
-	t := &Bot{username: cfg.BotUsername, linkURL: cfg.BotLinkURL, log: log}
+	t := &Bot{username: cfg.BotUsername, linkURL: cfg.BotLinkURL, startParam: cfg.StartParam, log: log}
 	if cfg.SendRatePerSecond > 0 {
 		t.limiter = rate.NewLimiter(rate.Limit(cfg.SendRatePerSecond), cfg.SendRatePerSecond)
 	}
@@ -87,7 +95,8 @@ func (t *Bot) Run(ctx context.Context) {
 }
 
 // handleStart replies to any message (typically /start) with the localized promo text
-// and a button that opens the main bot's Mini App, forwarding any /start payload.
+// and a button that opens the main bot's Mini App at the configured campaign payload
+// (falling back to forwarding any /start payload the user arrived with).
 func (t *Bot) handleStart(ctx context.Context, api *tgbot.Bot, update *models.Update) {
 	if update.Message == nil {
 		return
@@ -104,11 +113,16 @@ func (t *Bot) handleStart(ctx context.Context, api *tgbot.Bot, update *models.Up
 	if update.Message.From != nil {
 		lang = update.Message.From.LanguageCode
 	}
-	text, button := promoText(lang, t.username)
+	// The configured campaign payload (a variant-seed deep link) takes precedence; absent
+	// one, fall back to forwarding any /start payload the user arrived with. The same
+	// payload backs both the inline button and the @username link in the body.
+	param := cmp.Or(t.startParam, startPayload(update.Message.Text))
+	text, button := promoText(lang, t.username, t.launchURL(param))
 	if _, err := api.SendMessage(ctx, &tgbot.SendMessageParams{
 		ChatID:      update.Message.Chat.ID,
 		Text:        text,
-		ReplyMarkup: t.launchMarkup(button, startPayload(update.Message.Text)),
+		ParseMode:   models.ParseModeHTML,
+		ReplyMarkup: t.launchMarkup(button, param),
 	}); err != nil {
 		t.log.Warn("promo: reply to start failed", zap.Error(err))
 	}
@@ -159,11 +173,15 @@ func startPayload(text string) string {
 	return strings.TrimSpace(strings.TrimPrefix(text, cmd))
 }
 
-// promoText returns the localized message body and button label, naming the main bot
+// promoText returns the localized message body and button label. The body names the main
-// (Russian for a "ru" language code, English otherwise).
+// bot as a clickable @username whose link is the Mini App deep link (launchURL, the same
-func promoText(lang, username string) (text, button string) {
+// target as the button), so tapping the mention opens the seeded Mini App rather than the
+// bot profile. The body is sent with ParseMode HTML; only the link carries markup, so the
+// static sentences need no escaping. Russian for a "ru" language code, English otherwise.
+func promoText(lang, username, launchURL string) (text, button string) {
+	mention := `<a href="` + html.EscapeString(launchURL) + `">@` + html.EscapeString(username) + `</a>`
 	if strings.HasPrefix(strings.ToLower(lang), "ru") {
-		return "Откройте @" + username + " и выберите в настройках профиля нужный вариант игры.", "🤩 Хочу играть!"
+		return "Откройте " + mention + " и выберите в настройках профиля нужный вариант игры.", "🤩 Хочу играть!"
 	}
-	return "Open @" + username + " and choose your game variant in the profile settings.", "🤩 I want to play!"
+	return "Open " + mention + " and choose your game variant in the profile settings.", "🤩 I want to play!"
 }

platform/telegram/internal/promobot/promobot_test.go

@@ -13,25 +13,30 @@ import (
 )
 
 func TestPromoTextLocalization(t *testing.T) {
-	en, enBtn := promoText("en", "ScrabbleBot")
+	const url = "https://t.me/bot/app?startapp=verudit_ru-scrabble_en"
-	if !strings.Contains(en, "@ScrabbleBot") || !strings.Contains(en, "profile settings") {
+	// The @username is rendered as a clickable deep link (the same target as the button),
+	// not a plain mention, so tapping it opens the seeded Mini App.
+	wantLink := `<a href="` + url + `">@ScrabbleBot</a>`
+
+	en, enBtn := promoText("en", "ScrabbleBot", url)
+	if !strings.Contains(en, wantLink) || !strings.Contains(en, "profile settings") {
 		t.Errorf("en text = %q", en)
 	}
 	if enBtn != "🤩 I want to play!" {
 		t.Errorf("en button = %q", enBtn)
 	}
 
-	ru, ruBtn := promoText("ru-RU", "ScrabbleBot")
+	ru, ruBtn := promoText("ru-RU", "ScrabbleBot", url)
-	if !strings.Contains(ru, "@ScrabbleBot") || !strings.Contains(ru, "Откройте") {
+	if !strings.Contains(ru, wantLink) || !strings.Contains(ru, "Откройте") {
 		t.Errorf("ru text = %q", ru)
 	}
 	if ruBtn != "🤩 Хочу играть!" {
 		t.Errorf("ru button = %q", ruBtn)
 	}
 
-	// An unknown language falls back to English.
+	// An unknown language falls back to English, still with the linked mention.
-	if got, _ := promoText("de", "B"); !strings.Contains(got, "Open @B") {
+	if got, _ := promoText("de", "B", url); !strings.Contains(got, "Open ") || !strings.Contains(got, `">@B</a>`) {
-		t.Errorf("fallback text = %q, want English", got)
+		t.Errorf("fallback text = %q, want English with a linked mention", got)
 	}
 }
 
@@ -93,8 +98,8 @@ func TestHandleStartReplies(t *testing.T) {
 	if api.chatID != "42" {
 		t.Errorf("chat_id = %q, want 42", api.chatID)
 	}
-	if !strings.Contains(api.text, "@ScrabbleBot") {
+	if !strings.Contains(api.text, `<a href="https://t.me/bot/app?startapp=f99">@ScrabbleBot</a>`) {
-		t.Errorf("text = %q, want the @mention", api.text)
+		t.Errorf("text = %q, want the @mention linked to the startapp deep link", api.text)
 	}
 	if strings.Contains(api.replyMarkup, "web_app") {
 		t.Errorf("reply_markup = %q has a web_app button; want a url button", api.replyMarkup)

platform/telegram/internal/support/store.go

@@ -0,0 +1,227 @@
+// Package support persists the Telegram bot's support-relay state. For each user
+// who direct-messages the bot it records the dedicated forum topic the bot opened
+// in the operators' support chat, whether the user is blocked, and the ids of the
+// messages relayed into that topic — so an operator's "clear" can delete them while
+// keeping the topic's info card. The state is a small JSON file on a writable
+// volume: the bot host has no database.
+//
+// The store is concurrency-safe. The go-telegram/bot library dispatches each update
+// in its own goroutine, so every exported method locks. Mutators update only their
+// own fields (SetTopic never touches Blocked, SetBlocked never touches the relayed
+// ids) so a topic recreate cannot clobber a concurrent block toggle.
+package support
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"sync"
+	"time"
+)
+
+// User is one user's support-relay state.
+type User struct {
+	// UserID is the user's Telegram user id (the private chat id the bot relays to).
+	UserID int64 `json:"user_id"`
+	// TopicID is the forum topic's message_thread_id in the support chat; 0 means no
+	// topic has been created yet.
+	TopicID int `json:"topic_id"`
+	// HeaderMsgID is the info-card message that opens the topic and carries the
+	// block/clear buttons; it is never deleted by a clear.
+	HeaderMsgID int `json:"header_msg_id"`
+	// Blocked reports whether the bot drops this user's incoming messages.
+	Blocked bool `json:"blocked"`
+	// FirstName, LastName and Username snapshot the user's Telegram profile at the
+	// time the topic was created or last refreshed (for the topic name and info card).
+	FirstName string `json:"first_name,omitempty"`
+	LastName  string `json:"last_name,omitempty"`
+	Username  string `json:"username,omitempty"`
+	// RelayedMsgIDs are the ids of the messages posted into the topic after the header
+	// (the user's relayed messages and the operators' replies); a clear deletes them.
+	RelayedMsgIDs []int `json:"relayed_msg_ids,omitempty"`
+	// CreatedAt is when the topic was first opened for this user.
+	CreatedAt time.Time `json:"created_at"`
+}
+
+// Store is the concurrency-safe, JSON-backed support-relay state. The zero value is
+// not usable; build one with Open or New.
+type Store struct {
+	mu      sync.Mutex
+	path    string
+	users   map[int64]*User
+	byTopic map[int]int64 // TopicID -> UserID, for resolving operator replies
+}
+
+// file is the on-disk shape: a flat list of users. A JSON object keyed by user id
+// would force the int64 keys through strings; a list keeps the ids typed.
+type file struct {
+	Users []*User `json:"users"`
+}
+
+// New returns an empty store that persists to path, creating the parent directory
+// when missing. Use it as the fallback when Open reports a corrupt file.
+func New(path string) *Store {
+	_ = os.MkdirAll(filepath.Dir(path), 0o755)
+	return &Store{path: path, users: map[int64]*User{}, byTopic: map[int]int64{}}
+}
+
+// Open loads the store from path. A missing file yields an empty store and no
+// error; an unreadable or malformed file returns an error so the caller can decide
+// whether to start empty.
+func Open(path string) (*Store, error) {
+	s := New(path)
+	b, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return s, nil
+		}
+		return nil, fmt.Errorf("support: read state %s: %w", path, err)
+	}
+	var f file
+	if err := json.Unmarshal(b, &f); err != nil {
+		return nil, fmt.Errorf("support: parse state %s: %w", path, err)
+	}
+	for _, u := range f.Users {
+		if u == nil || u.UserID == 0 {
+			continue
+		}
+		s.users[u.UserID] = u
+		if u.TopicID != 0 {
+			s.byTopic[u.TopicID] = u.UserID
+		}
+	}
+	return s, nil
+}
+
+// Get returns a detached copy of the user's state and whether it exists.
+func (s *Store) Get(userID int64) (User, bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	u, ok := s.users[userID]
+	if !ok {
+		return User{}, false
+	}
+	cp := *u
+	cp.RelayedMsgIDs = append([]int(nil), u.RelayedMsgIDs...)
+	return cp, true
+}
+
+// ByTopic returns the user id owning the given forum topic, and whether one is known.
+func (s *Store) ByTopic(topicID int) (int64, bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	uid, ok := s.byTopic[topicID]
+	return uid, ok
+}
+
+// Blocked reports whether the user's incoming messages are dropped.
+func (s *Store) Blocked(userID int64) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if u, ok := s.users[userID]; ok {
+		return u.Blocked
+	}
+	return false
+}
+
+// SetTopic records the forum topic and info-card message opened for the user and
+// refreshes the profile snapshot, creating the record on first contact. It rebuilds
+// the topic index when the topic changes (a recreate) and preserves the block state
+// and the relayed-message ids. It persists the result.
+func (s *Store) SetTopic(userID int64, topicID, headerMsgID int, firstName, lastName, username string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	u, ok := s.users[userID]
+	if !ok {
+		u = &User{UserID: userID, CreatedAt: time.Now().UTC()}
+		s.users[userID] = u
+	} else if u.TopicID != 0 && u.TopicID != topicID {
+		delete(s.byTopic, u.TopicID)
+	}
+	u.TopicID = topicID
+	u.HeaderMsgID = headerMsgID
+	u.FirstName, u.LastName, u.Username = firstName, lastName, username
+	if topicID != 0 {
+		s.byTopic[topicID] = userID
+	}
+	return s.save()
+}
+
+// SetBlocked sets the user's blocked flag, creating a minimal record when none
+// exists, and persists the result.
+func (s *Store) SetBlocked(userID int64, blocked bool) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	u, ok := s.users[userID]
+	if !ok {
+		u = &User{UserID: userID, CreatedAt: time.Now().UTC()}
+		s.users[userID] = u
+	}
+	u.Blocked = blocked
+	return s.save()
+}
+
+// AppendMsg records a message posted into the user's topic (for a later clear) and
+// persists the result. It is a no-op when the user has no record yet.
+func (s *Store) AppendMsg(userID int64, msgID int) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	u, ok := s.users[userID]
+	if !ok {
+		return nil
+	}
+	u.RelayedMsgIDs = append(u.RelayedMsgIDs, msgID)
+	return s.save()
+}
+
+// ClearMsgs empties and returns the user's relayed-message ids (the info card is not
+// among them) and persists the result, so the caller can delete them from the chat.
+func (s *Store) ClearMsgs(userID int64) ([]int, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	u, ok := s.users[userID]
+	if !ok || len(u.RelayedMsgIDs) == 0 {
+		return nil, nil
+	}
+	ids := u.RelayedMsgIDs
+	u.RelayedMsgIDs = nil
+	if err := s.save(); err != nil {
+		// Roll back so the ids are not lost if the write fails.
+		u.RelayedMsgIDs = ids
+		return nil, err
+	}
+	return ids, nil
+}
+
+// save writes the state atomically (temp file in the same directory, then rename).
+// The caller must hold s.mu.
+func (s *Store) save() error {
+	f := file{Users: make([]*User, 0, len(s.users))}
+	for _, u := range s.users {
+		f.Users = append(f.Users, u)
+	}
+	sort.Slice(f.Users, func(i, j int) bool { return f.Users[i].UserID < f.Users[j].UserID })
+	b, err := json.MarshalIndent(f, "", "  ")
+	if err != nil {
+		return fmt.Errorf("support: marshal state: %w", err)
+	}
+	tmp, err := os.CreateTemp(filepath.Dir(s.path), ".support-*.json")
+	if err != nil {
+		return fmt.Errorf("support: create temp state: %w", err)
+	}
+	tmpName := tmp.Name()
+	defer func() { _ = os.Remove(tmpName) }() // no-op once the rename succeeds
+	if _, err := tmp.Write(b); err != nil {
+		_ = tmp.Close()
+		return fmt.Errorf("support: write temp state: %w", err)
+	}
+	if err := tmp.Close(); err != nil {
+		return fmt.Errorf("support: close temp state: %w", err)
+	}
+	if err := os.Rename(tmpName, s.path); err != nil {
+		return fmt.Errorf("support: replace state %s: %w", s.path, err)
+	}
+	return nil
+}

platform/telegram/internal/support/store_test.go

@@ -0,0 +1,178 @@
+package support
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+	"testing"
+)
+
+// statePath returns a path inside a fresh temp directory for a store file.
+func statePath(t *testing.T) string {
+	t.Helper()
+	return filepath.Join(t.TempDir(), "support.json")
+}
+
+func TestOpenMissingReturnsEmpty(t *testing.T) {
+	s, err := Open(statePath(t))
+	if err != nil {
+		t.Fatalf("Open missing: %v", err)
+	}
+	if _, ok := s.Get(42); ok {
+		t.Error("Get on an empty store returned a record")
+	}
+}
+
+func TestOpenCorruptReturnsError(t *testing.T) {
+	path := statePath(t)
+	if err := os.WriteFile(path, []byte("{not json"), 0o600); err != nil {
+		t.Fatalf("write corrupt: %v", err)
+	}
+	if _, err := Open(path); err == nil {
+		t.Fatal("Open on a corrupt file: expected an error, got nil")
+	}
+}
+
+func TestSetTopicPersistsAndReloads(t *testing.T) {
+	path := statePath(t)
+	s := New(path)
+	if err := s.SetTopic(7, 100, 101, "Ann", "Lee", "annlee"); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+
+	// In-memory view.
+	got, ok := s.Get(7)
+	if !ok || got.TopicID != 100 || got.HeaderMsgID != 101 || got.Username != "annlee" {
+		t.Fatalf("Get = %+v ok=%v, want topic 100 / header 101 / annlee", got, ok)
+	}
+	if got.CreatedAt.IsZero() {
+		t.Error("CreatedAt not set on first contact")
+	}
+	if uid, ok := s.ByTopic(100); !ok || uid != 7 {
+		t.Errorf("ByTopic(100) = %d ok=%v, want 7/true", uid, ok)
+	}
+
+	// Reloaded from disk.
+	reload, err := Open(path)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	got, ok = reload.Get(7)
+	if !ok || got.TopicID != 100 || got.FirstName != "Ann" {
+		t.Fatalf("reloaded Get = %+v ok=%v, want topic 100 / Ann", got, ok)
+	}
+	if uid, ok := reload.ByTopic(100); !ok || uid != 7 {
+		t.Errorf("reloaded ByTopic(100) = %d ok=%v, want 7/true", uid, ok)
+	}
+}
+
+func TestSetTopicRecreateReindexes(t *testing.T) {
+	s := New(statePath(t))
+	if err := s.SetTopic(7, 100, 101, "Ann", "", ""); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+	if err := s.SetTopic(7, 200, 201, "Ann", "", ""); err != nil {
+		t.Fatalf("SetTopic recreate: %v", err)
+	}
+	if _, ok := s.ByTopic(100); ok {
+		t.Error("ByTopic(100) still resolves after recreate; the stale topic was not dropped")
+	}
+	if uid, ok := s.ByTopic(200); !ok || uid != 7 {
+		t.Errorf("ByTopic(200) = %d ok=%v, want 7/true", uid, ok)
+	}
+}
+
+// TestBlockSurvivesTopicRecreate is the field-isolation guarantee: a topic recreate
+// (SetTopic) must not clear a block set concurrently from the buttons.
+func TestBlockSurvivesTopicRecreate(t *testing.T) {
+	s := New(statePath(t))
+	if err := s.SetTopic(7, 100, 101, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+	if err := s.SetBlocked(7, true); err != nil {
+		t.Fatalf("SetBlocked: %v", err)
+	}
+	if err := s.SetTopic(7, 200, 201, "Ann", "", "annlee"); err != nil {
+		t.Fatalf("SetTopic recreate: %v", err)
+	}
+	if !s.Blocked(7) {
+		t.Error("block was cleared by a topic recreate")
+	}
+}
+
+func TestAppendAndClearMsgs(t *testing.T) {
+	s := New(statePath(t))
+	if err := s.SetTopic(7, 100, 101, "Ann", "", ""); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+	for _, id := range []int{500, 501, 502} {
+		if err := s.AppendMsg(7, id); err != nil {
+			t.Fatalf("AppendMsg %d: %v", id, err)
+		}
+	}
+	got, _ := s.Get(7)
+	if len(got.RelayedMsgIDs) != 3 {
+		t.Fatalf("RelayedMsgIDs = %v, want 3 ids", got.RelayedMsgIDs)
+	}
+
+	ids, err := s.ClearMsgs(7)
+	if err != nil {
+		t.Fatalf("ClearMsgs: %v", err)
+	}
+	if len(ids) != 3 || ids[0] != 500 || ids[2] != 502 {
+		t.Errorf("ClearMsgs = %v, want [500 501 502]", ids)
+	}
+	got, _ = s.Get(7)
+	if len(got.RelayedMsgIDs) != 0 {
+		t.Errorf("RelayedMsgIDs after clear = %v, want empty", got.RelayedMsgIDs)
+	}
+	if got.HeaderMsgID != 101 || got.TopicID != 100 {
+		t.Errorf("clear disturbed the topic/header: %+v", got)
+	}
+
+	// A second clear is a no-op.
+	if ids, err := s.ClearMsgs(7); err != nil || ids != nil {
+		t.Errorf("second ClearMsgs = %v, %v, want nil, nil", ids, err)
+	}
+}
+
+func TestGetReturnsDetachedCopy(t *testing.T) {
+	s := New(statePath(t))
+	if err := s.SetTopic(7, 100, 101, "Ann", "", ""); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+	if err := s.AppendMsg(7, 500); err != nil {
+		t.Fatalf("AppendMsg: %v", err)
+	}
+	got, _ := s.Get(7)
+	got.RelayedMsgIDs[0] = 999 // mutate the copy
+	again, _ := s.Get(7)
+	if again.RelayedMsgIDs[0] != 500 {
+		t.Error("Get returned a slice that aliases the store's state")
+	}
+}
+
+// TestConcurrentMutationsSafe exercises the mutex under parallel writers; run with
+// -race to catch data races.
+func TestConcurrentMutationsSafe(t *testing.T) {
+	s := New(statePath(t))
+	if err := s.SetTopic(7, 100, 101, "Ann", "", ""); err != nil {
+		t.Fatalf("SetTopic: %v", err)
+	}
+	var wg sync.WaitGroup
+	for i := range 20 {
+		wg.Add(1)
+		go func(n int) {
+			defer wg.Done()
+			_ = s.AppendMsg(7, 1000+n)
+			_ = s.SetBlocked(7, n%2 == 0)
+			_, _ = s.Get(7)
+			_, _ = s.ByTopic(100)
+		}(i)
+	}
+	wg.Wait()
+	got, ok := s.Get(7)
+	if !ok || len(got.RelayedMsgIDs) != 20 {
+		t.Errorf("after concurrent appends: %d ids, want 20", len(got.RelayedMsgIDs))
+	}
+}

ui/e2e/fixtures.ts

@@ -1,13 +1,13 @@
 import { test as base } from '@playwright/test';
 
 // All e2e specs run hermetically against the mock transport. Neutralise the real
-// telegram-web-app.js (loaded from the CDN in index.html) so the suite never blocks
+// telegram-web-app.js (the app loads it dynamically — see lib/telegram.ts loadTelegramSDK) so the
-// on telegram.org — it is unreachable from the CI runner, and a render-blocking
+// suite never reaches telegram.org, which is unreachable from the CI runner. Specs that exercise
-// <script> to it would hang every page load. Specs that exercise the Telegram launch
+// the Telegram launch inject their own window.Telegram via addInitScript before navigating, so the
-// inject their own window.Telegram via addInitScript before navigating.
+// dynamic load short-circuits on the already-present SDK.
 export const test = base.extend({
   page: async ({ page }, use) => {
-    await page.route('**/telegram-web-app.js', (route) =>
+    await page.route('**/telegram-web-app.js*', (route) =>
       route.fulfill({ status: 200, contentType: 'application/javascript', body: '' }),
     );
     await use(page);

ui/e2e/social.spec.ts

@@ -44,6 +44,60 @@ test('friends: issue a code, accept an incoming request, redeem a code', async (
   await expect(page.locator('.who', { hasText: 'Friend 111111' })).toBeVisible();
 });
 
+test('friends: the row kebab reveals block/remove and an outside tap closes it', async ({ page }) => {
+  await loginLobby(page);
+  await openFriends(page);
+
+  // A friend row slides open on its kebab (like the lobby), exposing two icon actions.
+  const kaya = page.locator('.rowwrap', { hasText: 'Kaya' });
+  await kaya.locator('.kebab').click();
+  await expect(kaya).toHaveClass(/revealed/);
+  await expect(kaya.locator('.acts').getByRole('button', { name: 'Block' })).toBeVisible();
+  await expect(kaya.locator('.acts').getByRole('button', { name: 'Remove' })).toBeVisible();
+
+  // A tap anywhere outside the action buttons collapses the row again.
+  await page.getByRole('heading', { name: 'Your friends' }).click();
+  await expect(kaya).not.toHaveClass(/revealed/);
+});
+
+test('friends: blocking from the list confirms (naming the friend) and moves them to Blocked', async ({ page }) => {
+  await loginLobby(page);
+  await openFriends(page);
+
+  const kaya = page.locator('.rowwrap', { hasText: 'Kaya' });
+  await kaya.locator('.kebab').click();
+  await kaya.locator('.acts').getByRole('button', { name: 'Block' }).click();
+
+  // The confirmation keeps a generic title and names the friend in the body.
+  const dialog = page.getByRole('dialog');
+  await expect(dialog.getByText('Block this player?')).toBeVisible();
+  await expect(dialog.locator('.confirm-name')).toHaveText('Kaya');
+  await dialog.getByRole('button', { name: 'Block' }).click();
+
+  // The block applied: Kaya leaves the friends list and shows under Blocked players.
+  await expect(page.getByText('No friends yet.')).toBeVisible();
+  const blocked = page.locator('.rowwrap', { hasText: 'Kaya' });
+  await expect(blocked.getByRole('button', { name: 'Unblock' })).toBeVisible();
+});
+
+test('friends: removing from the list confirms (naming the friend) and drops them', async ({ page }) => {
+  await loginLobby(page);
+  await openFriends(page);
+
+  const kaya = page.locator('.rowwrap', { hasText: 'Kaya' });
+  await kaya.locator('.kebab').click();
+  await kaya.locator('.acts').getByRole('button', { name: 'Remove' }).click();
+
+  const dialog = page.getByRole('dialog');
+  await expect(dialog.getByText('Remove from friends?')).toBeVisible();
+  await expect(dialog.locator('.confirm-name')).toHaveText('Kaya');
+  await dialog.getByRole('button', { name: 'Remove' }).click();
+
+  // Unfriending just drops the friendship — Kaya is gone and not blocked.
+  await expect(page.getByText('No friends yet.')).toBeVisible();
+  await expect(page.locator('.rowwrap', { hasText: 'Kaya' })).toHaveCount(0);
+});
+
 test('invitations: the lobby shows an invitation and accepting clears it', async ({ page }) => {
   await loginLobby(page);
   await expect(page.getByText('Invitations')).toBeVisible();

ui/e2e/telegram.spec.ts

@@ -107,11 +107,30 @@ test('inside Telegram, a failed launch shows the retry screen, not the web login
   await expect(page.getByRole('button', { name: /guest/i })).toHaveCount(0);
 });
 
-test('outside Telegram, the /telegram/ entry redirects to the site root', async ({ page }) => {
+test('outside Telegram, the /telegram/ entry shows the launch diagnostic, not a redirect', async ({
+  page,
+}) => {
   await page.goto('/telegram/');
 
-  // The guard sends a non-Telegram visitor back to the root, where the normal
+  // The entry no longer bounces a visitor without Telegram sign-in data to the marketing landing;
-  // (guest / email) login is shown.
+  // it shows a compact diagnostic screen (Share + Retry) that helps pinpoint why initData was
-  await expect(page.getByRole('button', { name: /guest/i })).toBeVisible();
+  // absent — notably the Android empty-initData failure.
-  await expect(page).not.toHaveURL(/\/telegram\//);
+  await expect(page.getByRole('button', { name: 'Share' })).toBeVisible();
+  await expect(page.getByRole('button', { name: 'Retry' })).toBeVisible();
+  // It stays on /telegram/ (no redirect) and never shows the web (guest) login.
+  await expect(page).toHaveURL(/\/telegram\//);
+  await expect(page.getByRole('button', { name: /guest/i })).toHaveCount(0);
+});
+
+test('a blocked telegram-web-app.js does not hang the diagnostic screen', async ({ page }) => {
+  // Simulate a network where telegram.org is unreachable: the SDK fetch fails. Because the SPA
+  // loads the SDK dynamically with a timeout (not a render-blocking <script>), a failed/blocked
+  // fetch must not strand the page — the diagnostic screen still renders, reporting no SDK. (This
+  // route overrides the fixture's empty-body fulfill; the later registration wins.)
+  await page.route('**/telegram-web-app.js*', (route) => route.abort());
+  await page.goto('/telegram/');
+
+  await expect(page.getByRole('button', { name: 'Share' })).toBeVisible();
+  // The diagnostic names the load outcome: a failed fetch reads as sdk-load: error.
+  await expect(page.getByText('sdk-load: error')).toBeVisible();
 });

ui/index.html

@@ -2,9 +2,11 @@
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
-    <!-- Telegram Mini App SDK: defines window.Telegram.WebApp. Harmless outside
+    <!-- The Telegram Mini App SDK (window.Telegram.WebApp) is deliberately NOT loaded here: a
-         Telegram (initData is empty), so it loads on every entry. -->
+         render-blocking <script> to telegram.org hangs the whole page on a network that blocks
-    <script src="https://telegram.org/js/telegram-web-app.js"></script>
+         telegram.org (common where Telegram itself reaches users only over a proxy), stranding even
+         the launch-diagnostic screen. The app loads it dynamically, with a timeout, only on a
+         Telegram entry — see lib/telegram.ts loadTelegramSDK and lib/app.svelte.ts bootstrap. -->
     <!-- user-scalable=no: the board owns zoom; we do not want the browser's pinch
          to fight our two-state zoom. viewport-fit=cover for native (Capacitor). -->
     <meta

ui/src/App.svelte

@@ -2,13 +2,13 @@
   import { onMount } from 'svelte';
   import { cubicOut } from 'svelte/easing';
   import { app, bootstrap } from './lib/app.svelte';
-  import { navigate, router, type RouteName } from './lib/router.svelte';
+  import { router, type RouteName } from './lib/router.svelte';
   import { t } from './lib/i18n/index.svelte';
-  import { insideTelegram, telegramBackButton } from './lib/telegram';
   import Toast from './components/Toast.svelte';
   import Splash from './components/Splash.svelte';
   import StaleInviteModal from './components/StaleInviteModal.svelte';
   import WelcomeRedeemModal from './components/WelcomeRedeemModal.svelte';
+  import DebugPanel from './components/DebugPanel.svelte';
   import Login from './screens/Login.svelte';
   import Lobby from './screens/Lobby.svelte';
   import NewGame from './screens/NewGame.svelte';
@@ -19,6 +19,7 @@
   import Feedback from './screens/Feedback.svelte';
   import Blocked from './screens/Blocked.svelte';
   import BootError from './screens/BootError.svelte';
+  import TelegramLaunchError from './screens/TelegramLaunchError.svelte';
 
   onMount(() => {
     void bootstrap();
@@ -29,19 +30,6 @@
   // another screen is not covered.
   const routeIsLobby = $derived(router.route.name === 'lobby');
 
-  // Inside Telegram, drive its native header back button: show it on any sub-screen
-  // (everything returns to the lobby root), hide it on the lobby/login. The app's own
-  // back chevron is hidden in Telegram (Header.svelte) so only the native one shows.
-  $effect(() => {
-    if (!insideTelegram()) return;
-    const r = router.route;
-    // The chat / check sub-screens step back to their game; every other sub-screen to the lobby.
-    let target = '/';
-    if (r.name === 'gameChat' || r.name === 'gameCheck') target = `/game/${r.params.id}`;
-    else if (r.name === 'feedback') target = '/about'; // back to the Settings → Info tab
-    telegramBackButton(r.name !== 'lobby' && r.name !== 'login', () => navigate(target));
-  });
-
   // Screen transitions: the lobby is the navigation root. Entering a screen from the
   // lobby slides it in from the right (forward); returning to the lobby slides the
   // screen out to the right and reveals the lobby (back). Transitions are local, so
@@ -84,6 +72,11 @@
   {#if !routeIsLobby}
     <div class="splash">{t('common.loading')}</div>
   {/if}
+{:else if app.launchError}
+  <!-- The /telegram/ entry without sign-in data: a compact, shareable diagnostic screen instead
+       of bouncing to the marketing landing (also the probe for the empty-initData failure on
+       some Android clients). -->
+  <TelegramLaunchError />
 {:else if app.bootError}
   <!-- A Mini App launch that failed to authenticate (e.g. the backend was down mid-deploy):
        show the retry screen instead of falling back to the web login. -->
@@ -128,10 +121,14 @@
 <StaleInviteModal />
 <WelcomeRedeemModal />
 
-{#if routeIsLobby && !app.splashDone && !app.blocked && !app.bootError}
+{#if routeIsLobby && !app.splashDone && !app.blocked && !app.bootError && !app.launchError}
   <Splash />
 {/if}
 
+{#if app.debugOpen}
+  <DebugPanel />
+{/if}
+
 <style>
   .splash {
     height: 100%;

ui/src/components/DebugPanel.svelte

@@ -0,0 +1,71 @@
+<script lang="ts">
+  // Hidden on-device debug panel, opened by tapping the header title ten times (Header.svelte) and
+  // closed by tapping anywhere except the Share control. It shows a privacy-safe client diagnostic
+  // snapshot (no secrets, no initData values, no IP) and shares it through the OS share sheet (or a
+  // clipboard copy on desktop) — a support aid for reproducing client-specific issues, e.g. the
+  // Telegram Android presentation quirks. Drawn from the top, just under the app header.
+  import { app, closeDebug } from '../lib/app.svelte';
+  import { connection } from '../lib/connection.svelte';
+  import { shareText } from '../lib/share';
+  import { telegramChromeDiag } from '../lib/telegram';
+
+  const report = [
+    `app: ${__APP_VERSION__}`,
+    `locale: ${app.locale}  theme: ${app.theme}  reduceMotion: ${app.reduceMotion}`,
+    `online: ${connection.online}  streamAlive: ${app.streamAlive}`,
+    `userId: ${app.session?.userId ?? '—'}  guest: ${app.profile?.isGuest ?? '—'}`,
+    telegramChromeDiag(),
+  ].join('\n');
+
+  let label = $state('Share');
+  async function share(e: MouseEvent): Promise<void> {
+    e.stopPropagation(); // a tap on Share shares; it must not also close the panel
+    const r = await shareText(report, `Scrabble debug ${__APP_VERSION__}`);
+    if (r === 'copied') {
+      label = 'Copied';
+      setTimeout(() => (label = 'Share'), 1500);
+    }
+  }
+</script>
+
+<!-- svelte-ignore a11y_click_events_have_key_events -->
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="overlay" onclick={closeDebug}>
+  <button class="share" onclick={share}>{label}</button>
+  <pre class="body">{report}</pre>
+</div>
+
+<style>
+  .overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 10000;
+    /* Drawn from the top; the content clears the app header (~56px + the device safe-area). */
+    padding: calc(var(--tg-safe-top, 0px) + 56px) 12px 16px;
+    background: rgba(0, 0, 0, 0.82);
+    overflow: auto;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    align-items: flex-start;
+  }
+  .share {
+    flex: 0 0 auto;
+    padding: 7px 16px;
+    border: 1px solid var(--accent);
+    background: var(--accent);
+    color: var(--accent-text);
+    border-radius: var(--radius-sm);
+    font-size: 0.95rem;
+  }
+  .body {
+    margin: 0;
+    width: 100%;
+    white-space: pre-wrap;
+    overflow-wrap: anywhere;
+    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+    font-size: 11px;
+    line-height: 1.45;
+    color: #d6e6ff;
+  }
+</style>

ui/src/components/Header.svelte

@@ -1,17 +1,30 @@
 <script lang="ts">
   import { navigate } from '../lib/router.svelte';
-  import { insideTelegram } from '../lib/telegram';
   import { connection } from '../lib/connection.svelte';
   import { t } from '../lib/i18n/index.svelte';
-  import { app } from '../lib/app.svelte';
+  import { app, openDebug } from '../lib/app.svelte';
   import Spinner from './Spinner.svelte';
   import AdBanner from './AdBanner.svelte';
 
   let { title, back, grow = false }: { title: string; back?: string; grow?: boolean } = $props();
 
-  // Inside Telegram the native header back button (App.svelte) is the back control, so
+  // The app always shows its own back chevron when there is a back target — on every platform, in
-  // the app's own chevron is hidden to avoid two back affordances.
+  // and out of Telegram. The native Telegram BackButton is not used: it does not render reliably in
-  const showBack = $derived(!!back && !insideTelegram());
+  // the windowed Mini App (relying on it would lose back navigation there).
+  const showBack = $derived(!!back);
+
+  // Ten quick taps on the title open the hidden debug panel (components/DebugPanel) — a support aid.
+  let titleTaps = 0;
+  let lastTitleTap = 0;
+  function onTitleTap(): void {
+    const now = Date.now();
+    titleTaps = now - lastTitleTap < 400 ? titleTaps + 1 : 1;
+    lastTitleTap = now;
+    if (titleTaps >= 10) {
+      titleTaps = 0;
+      openDebug();
+    }
+  }
 </script>
 
 <header class="nav" class:grow>
@@ -24,7 +37,9 @@
       <span class="spacer"></span>
     {/if}
     {#if connection.online}
-      <h1>{title}</h1>
+      <!-- svelte-ignore a11y_click_events_have_key_events -->
+      <!-- svelte-ignore a11y_no_noninteractive_element_interactions -->
+      <h1 onclick={onTitleTap}>{title}</h1>
     {:else}
       <h1 class="connecting"><Spinner /> <span>{t('connection.connecting')}</span></h1>
     {/if}
@@ -66,7 +81,7 @@
     display: flex;
     align-items: center;
     gap: var(--gap);
-    padding: 10px var(--pad);
+    padding: 5px var(--pad);
   }
   h1 {
     font-size: 1.05rem;
@@ -124,15 +139,15 @@
        back chevron is hidden), so min-height (the nav-band height) doesn't bind. Without the
        (removed) hamburger that content shrank and the bar sat flush under Telegram's native nav
        band. So **padding-top** is the lever: it drops the title clear of the band — the notch
-       plus a **10px** gap (was 6). A fixed px (not rem/em) gap so the clearance from Telegram's
+       plus an **8px** gap (halved from 16). A fixed px (not rem/em) gap so the clearance from
-       native controls stays constant if the user scales up the font (the title then grows
+       Telegram's native controls stays constant if the user scales up the font (the title then
-       downward and the bar with it). (Owner-tunable: the 10px.) */
+       grows downward and the bar with it). (Owner-tunable: the 8px.) */
     min-height: var(--tg-content-top);
     box-sizing: border-box;
     align-items: center;
     justify-content: center;
-    padding-top: calc(var(--tg-safe-top) + 16px);
+    padding-top: calc(var(--tg-safe-top) + 8px);
-    padding-bottom: 6px;
+    padding-bottom: 3px;
   }
   :global(html.tg-fullscreen) .spacer {
     display: none;

ui/src/game/Game.svelte

@@ -24,7 +24,7 @@
   import { getCachedGame, setCachedGame, setCachedDraft, type CachedGame } from '../lib/gamecache';
   import { patchLobbyGame } from '../lib/lobbycache';
   import { applyGameOver, applyMoveDelta, applyOpponentJoined, type DeltaResult } from '../lib/gamedelta';
-  import { telegramClosingConfirmation, telegramHaptic } from '../lib/telegram';
+  import { telegramHaptic } from '../lib/telegram';
   import {
     BLANK,
     newPlacement,
@@ -228,8 +228,6 @@
     placement = tiles.length ? placementFromHint(tiles, rack) : newPlacement(rack);
   }
   onMount(() => {
-    // Guard against an accidental swipe-close losing the open game (Telegram).
-    telegramClosingConfirmation(true);
     // Render instantly from the cache (a game opened before), then refresh in the
     // background. A cold open shows the loading state until load() resolves.
     const cached = getCachedGame(id);
@@ -579,7 +577,6 @@
       clearTimeout(draftSaveTimer);
       void gateway.draftSave(id, serializeDraft(rackIds, placement.pending)).catch(() => {});
     }
-    telegramClosingConfirmation(false);
   });
 
   function onCell(row: number, col: number) {

ui/src/lib/app.svelte.ts

@@ -12,7 +12,11 @@ import { languageNeedsServerSync } from './language';
 import { applyReduceMotion, applyTelegramTheme, applyTheme, type ThemePref } from './theme';
 import {
   insideTelegram,
+  collectTelegramDiag,
+  type TelegramDiag,
   onTelegramPath,
+  hasLaunchFragment,
+  loadTelegramSDK,
   telegramColorScheme,
   telegramContentSafeAreaTop,
   telegramSafeAreaTop,
@@ -21,7 +25,6 @@ import {
   telegramLaunch,
   type TelegramLaunch,
   telegramOnEvent,
-  telegramRequestFullscreen,
   telegramSetChrome,
 } from './telegram';
 import { parseStartParam } from './deeplink';
@@ -47,6 +50,14 @@ export const app = $state<{
    *  backend was down during a deploy). App.svelte then renders the boot-error retry screen
    *  instead of the web login — a Mini App has no manual sign-in to fall back to. */
   bootError: boolean;
+  /** On the dedicated /telegram/ entry, set to a privacy-safe diagnostic snapshot when a Mini App
+   *  launch carried no sign-in data (empty initData). App.svelte then renders the compact
+   *  launch-error screen (screens/TelegramLaunchError) — a shareable probe for why Telegram
+   *  delivered no initData (seen on some Android clients) — instead of bouncing to the landing. */
+  launchError: TelegramDiag | null;
+  /** Whether the hidden on-device debug panel (components/DebugPanel) is open — toggled by tapping
+   *  the header title ten times in quick succession. A support aid; carries no secrets. */
+  debugOpen: boolean;
   /** Whether the lobby's first cold load has settled (success or error). The loading splash
    *  (components/Splash.svelte) watches it to know when to dismiss; set by screens/Lobby. */
   lobbyReady: boolean;
@@ -96,6 +107,8 @@ export const app = $state<{
 }>({
   ready: false,
   bootError: false,
+  launchError: null,
+  debugOpen: false,
   lobbyReady: false,
   splashDone: false,
   streamAlive: false,
@@ -187,6 +200,16 @@ export function dismissWelcomeRedeem(): void {
   app.welcomeRedeem = false;
 }
 
+/** openDebug / closeDebug toggle the hidden on-device debug panel (components/DebugPanel), opened
+ *  by tapping the header title ten times — a support aid that shows and shares client diagnostics. */
+export function openDebug(): void {
+  app.debugOpen = true;
+}
+
+export function closeDebug(): void {
+  app.debugOpen = false;
+}
+
 /**
  * seedChatUnread sets a game's unread flags from an authoritative per-viewer REST view (the lobby
  * list, a game's state, or a move result): unread is any unread entry, message whether one of them
@@ -530,6 +553,31 @@ function syncViewportHeight(): void {
   if (h > 0) document.documentElement.style.setProperty('--vvh', `${h}px`);
 }
 
+/**
+ * applyTelegramChrome applies a Mini App launch's visual integration: Telegram's authoritative
+ * colour scheme and theme, the matching header / background / bottom chrome, the safe-area insets,
+ * the swipe-down guard, and immersive fullscreen on mobile. It is idempotent, so both the initial
+ * bootstrap and a manual launch retry call it.
+ */
+function applyTelegramChrome(launch: TelegramLaunch): void {
+  if (launch.theme) applyTelegramTheme(launch.theme);
+  // Inside Telegram the colour scheme is Telegram's to decide; force it explicitly so the OS
+  // prefers-color-scheme (which leaks into the Telegram Desktop webview) cannot fight it. Falls
+  // back to the stored preference when the SDK omits it.
+  applyTheme(telegramColorScheme() ?? app.theme);
+  // Match Telegram's chrome to the app and stop its swipe-down-to-minimise from fighting tile
+  // drag / board scroll.
+  syncTelegramChrome();
+  syncTelegramSafeArea();
+  telegramDisableVerticalSwipes();
+}
+
+/** How long to wait for the dynamically loaded Telegram Mini App SDK before giving up and showing
+ *  the launch-error screen. A network that blocks telegram.org makes the script hang rather than
+ *  fail fast (a connection refusal resolves immediately via the script's error event), so this only
+ *  bounds a true hang; it is generous enough not to misfire on a slow but working network. */
+const TELEGRAM_SDK_TIMEOUT_MS = 10000;
+
 export async function bootstrap(): Promise<void> {
   const prefs = await loadPrefs();
   app.theme = prefs.theme ?? 'auto';
@@ -553,33 +601,30 @@ export async function bootstrap(): Promise<void> {
     window.visualViewport.addEventListener('scroll', syncViewportHeight);
   }
 
-  // Telegram Mini App launch: apply the platform theme, authenticate via initData,
+  // Load the Telegram Mini App SDK dynamically, with a timeout, on a Telegram entry — it is no
-  // and route any deep-link start parameter. On the dedicated /telegram/ entry path
+  // longer a render-blocking <script> in index.html, so a network that blocks telegram.org (common
-  // outside Telegram (no initData), refuse to render and send the visitor to the
+  // where Telegram itself reaches users only over a proxy) cannot hang the page and strand the app
-  // site root.
+  // or the diagnostic screen below. Skipped on a plain web / native entry, which never needs it.
+  if (onTelegramPath() || hasLaunchFragment()) {
+    await loadTelegramSDK(TELEGRAM_SDK_TIMEOUT_MS);
+  }
+  // Telegram Mini App launch: apply the platform theme, authenticate via initData, and route any
+  // deep-link start parameter. On the dedicated /telegram/ entry without sign-in data (no/empty
+  // initData — outside Telegram, or a Mini App launch that delivered none, as seen on some Android
+  // clients), render the compact launch-error screen with a diagnostic snapshot the user can share
+  // with the developer, instead of bouncing the visitor to the marketing landing.
   if (onTelegramPath() && !insideTelegram()) {
-    if (typeof location !== 'undefined') location.replace('/');
+    app.launchError = collectTelegramDiag();
+    app.ready = true;
     return;
   }
   if (insideTelegram()) {
     const launch = telegramLaunch();
-    if (launch.theme) applyTelegramTheme(launch.theme);
+    applyTelegramChrome(launch);
-    // Inside Telegram the colour scheme is Telegram's to decide; force it explicitly
+    // Re-sync the safe-area insets whenever Telegram's chrome changes (registered once per load).
-    // so the OS prefers-color-scheme (which leaks into the Telegram Desktop webview)
-    // cannot fight it. Falls back to the stored preference when the SDK omits it.
-    applyTheme(telegramColorScheme() ?? app.theme);
-    // Match Telegram's chrome to the app and stop its swipe-down-to-minimise from
-    // fighting tile drag / board scroll.
-    syncTelegramChrome();
-    syncTelegramSafeArea();
     telegramOnEvent('contentSafeAreaChanged', syncTelegramSafeArea);
     telegramOnEvent('safeAreaChanged', syncTelegramSafeArea);
     telegramOnEvent('fullscreenChanged', syncTelegramSafeArea);
-    telegramDisableVerticalSwipes();
-    // On mobile, go immersive fullscreen like Telegram's own Mini Apps; the fullscreenChanged
-    // listener above then re-syncs the safe-area insets. Desktop keeps the bot's full-size
-    // window. No-op on clients predating Bot API 8.0.
-    telegramRequestFullscreen();
     await bootTelegram(launch);
     app.ready = true;
     return;
@@ -646,6 +691,28 @@ export async function retryTelegramBoot(): Promise<void> {
   app.ready = true;
 }
 
+/**
+ * retryTelegramLaunch re-attempts a Mini App launch from the launch-error screen's Retry button. If
+ * sign-in data is present now (e.g. it arrived late on a slow client) it clears the error and runs
+ * the normal launch; otherwise it refreshes the diagnostic snapshot so the screen reflects the
+ * current state. It never reloads — telegram-web-app.js consumes the launch fragment on first load,
+ * so a reload could discard the very data we are waiting for.
+ */
+export async function retryTelegramLaunch(): Promise<void> {
+  // Re-attempt the SDK load — the network may have recovered since the launch-error screen showed.
+  await loadTelegramSDK(TELEGRAM_SDK_TIMEOUT_MS);
+  if (!insideTelegram()) {
+    app.launchError = collectTelegramDiag();
+    return;
+  }
+  app.launchError = null;
+  app.ready = false;
+  const launch = telegramLaunch();
+  applyTelegramChrome(launch);
+  await bootTelegram(launch);
+  app.ready = true;
+}
+
 /**
  * routeStartParam navigates a Telegram deep-link start parameter to its target: a
  * specific game, the friends screen with a friend-code redemption, or the lobby

ui/src/lib/i18n/en.ts

@@ -14,6 +14,11 @@ export const en = {
   'boot.errorTitle': "Couldn't load the game",
   'boot.errorBody': 'Please try again in a moment.',
 
+  'launch.errorTitle': "Can't open in Telegram",
+  'launch.errorBody': 'Screenshot or share this with the developer.',
+  'launch.share': 'Share',
+  'launch.copied': 'Copied',
+
   'common.back': 'Back',
   'common.cancel': 'Cancel',
   'common.ok': 'OK',
@@ -227,6 +232,9 @@ export const en = {
   'friends.decline': 'Decline',
   'friends.unfriend': 'Remove',
   'friends.block': 'Block',
+  'friends.actions': 'Actions',
+  'friends.blockConfirm': 'Block this player?',
+  'friends.unfriendConfirm': 'Remove from friends?',
   'friends.add': 'Add a friend',
   'friends.addFromGame': 'Add to friends',
   'friends.blockFromGame': 'Block player',
@@ -239,7 +247,7 @@ export const en = {
   'friends.redeem': 'Add',
   'friends.copy': 'Copy',
   'friends.codeCopied': 'Code copied.',
-  'friends.shareTelegram': 'Share via Telegram',
+  'friends.shareTelegram': 'Share',
   'friends.inviteText': "Let's play Scrabble!",
   'friends.linkCopied': 'Link copied.',
   'friends.selfInvite': "Hopefully you've been friends with yourself for a while ☺️",

ui/src/lib/i18n/ru.ts

@@ -15,6 +15,11 @@ export const ru: Record<MessageKey, string> = {
   'boot.errorTitle': 'Не удалось загрузить игру',
   'boot.errorBody': 'Попробуйте ещё раз или зайдите позже.',
 
+  'launch.errorTitle': 'Не открывается в Telegram',
+  'launch.errorBody': 'Сделайте скриншот или поделитесь с разработчиком.',
+  'launch.share': 'Поделиться',
+  'launch.copied': 'Скопировано',
+
   'common.back': 'Назад',
   'common.cancel': 'Отмена',
   'common.ok': 'ОК',
@@ -228,6 +233,9 @@ export const ru: Record<MessageKey, string> = {
   'friends.decline': 'Отклонить',
   'friends.unfriend': 'Удалить',
   'friends.block': 'Заблокировать',
+  'friends.actions': 'Действия',
+  'friends.blockConfirm': 'Заблокировать?',
+  'friends.unfriendConfirm': 'Удалить из друзей?',
   'friends.add': 'Добавить друга',
   'friends.addFromGame': 'В друзья',
   'friends.blockFromGame': 'Заблокировать',
@@ -240,7 +248,7 @@ export const ru: Record<MessageKey, string> = {
   'friends.redeem': 'Добавить',
   'friends.copy': 'Копировать',
   'friends.codeCopied': 'Код скопирован.',
-  'friends.shareTelegram': 'Поделиться через Telegram',
+  'friends.shareTelegram': 'Поделиться',
   'friends.inviteText': 'Давай играть в Эрудит!',
   'friends.linkCopied': 'Ссылка скопирована.',
   'friends.selfInvite': 'Надеюсь, что с собой Вы уже давно дружите ☺️',

ui/src/lib/share.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { pickGcgDelivery, shareOrDownloadGcg } from './share';
+import { pickGcgDelivery, pickTextShare, shareOrDownloadGcg, shareText } from './share';
 import type { GcgExport } from './model';
 
 const file = {} as File;
@@ -60,3 +60,42 @@ describe('shareOrDownloadGcg', () => {
     expect(anchor.click).toHaveBeenCalledOnce();
   });
 });
+
+describe('pickTextShare', () => {
+  it('shares when Web Share is available', () => {
+    expect(pickTextShare({ share: async () => {}, canShare: () => true })).toBe('share');
+  });
+
+  it('shares when share exists without canShare (text needs no file capability check)', () => {
+    expect(pickTextShare({ share: async () => {} })).toBe('share');
+  });
+
+  it('copies when there is no Web Share (desktop)', () => {
+    expect(pickTextShare(undefined)).toBe('copy');
+    expect(pickTextShare({} as never)).toBe('copy');
+  });
+});
+
+describe('shareText', () => {
+  afterEach(() => vi.unstubAllGlobals());
+
+  it('uses the OS share sheet when available', async () => {
+    const share = vi.fn().mockResolvedValue(undefined);
+    vi.stubGlobal('navigator', { share, canShare: () => true });
+    expect(await shareText('diag', 'title')).toBe('shared');
+    expect(share).toHaveBeenCalledWith({ title: 'title', text: 'diag' });
+  });
+
+  it('copies to the clipboard when Web Share is absent (desktop)', async () => {
+    const writeText = vi.fn().mockResolvedValue(undefined);
+    vi.stubGlobal('navigator', { clipboard: { writeText } });
+    expect(await shareText('diag', 'title')).toBe('copied');
+    expect(writeText).toHaveBeenCalledWith('diag');
+  });
+
+  it('reports failure without a fallback when the share is cancelled', async () => {
+    const share = vi.fn().mockRejectedValue(new DOMException('cancelled', 'AbortError'));
+    vi.stubGlobal('navigator', { share, canShare: () => true });
+    expect(await shareText('diag', 'title')).toBe('failed');
+  });
+});

ui/src/lib/share.ts

@@ -51,3 +51,42 @@ function downloadFile(content: string, filename: string): void {
   a.remove();
   URL.revokeObjectURL(url);
 }
+
+type TextShareNav = Pick<Navigator, 'share'> & { canShare?: Navigator['canShare'] };
+
+/**
+ * pickTextShare decides how to deliver a plain-text payload: through the OS share sheet (Web Share,
+ * available on mobile including the Telegram Mini App) or, on a desktop browser without it, a
+ * clipboard copy. Pure, so it is unit-tested with a mock navigator.
+ */
+export function pickTextShare(nav: TextShareNav | undefined): 'share' | 'copy' {
+  if (nav && typeof nav.share === 'function' && (typeof nav.canShare !== 'function' || nav.canShare({ text: 'x' }))) {
+    return 'share';
+  }
+  return 'copy';
+}
+
+/**
+ * shareText delivers text through the OS share sheet where supported, else copies it to the
+ * clipboard. It reports the path taken — 'shared', 'copied', or 'failed' (a cancelled share or an
+ * unavailable clipboard) — so the caller can confirm a silent copy to the user. Like
+ * shareOrDownloadGcg it never strands the webview: a cancelled share simply does nothing.
+ */
+export async function shareText(text: string, title: string): Promise<'shared' | 'copied' | 'failed'> {
+  const nav = typeof navigator !== 'undefined' ? navigator : undefined;
+  if (!nav) return 'failed';
+  if (pickTextShare(nav) === 'share') {
+    try {
+      await nav.share({ title, text });
+      return 'shared';
+    } catch {
+      return 'failed';
+    }
+  }
+  try {
+    await nav.clipboard.writeText(text);
+    return 'copied';
+  } catch {
+    return 'failed';
+  }
+}

ui/src/lib/telegram.test.ts

@@ -1,11 +1,12 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import {
+  collectTelegramDiag,
   insideTelegram,
+  loadTelegramSDK,
+  telegramSdkOutcome,
   routeExternalLinkInTelegram,
-  telegramClosingConfirmation,
   telegramLaunch,
   telegramOpenExternalLink,
-  telegramRequestFullscreen,
 } from './telegram';
 
 function stubWebApp(initData: string, startParam?: string) {
@@ -45,69 +46,6 @@ describe('telegram launch detection', () => {
   });
 });
 
-// stubClient stands up a fake WebApp on the given platform with spies for the mobile-gated
-// chrome toggles, so the platform gate can be asserted without a real Telegram client.
-function stubClient(platform?: string) {
-  const enable = vi.fn();
-  const disable = vi.fn();
-  const requestFullscreen = vi.fn();
-  vi.stubGlobal('window', {
-    Telegram: {
-      WebApp: { platform, enableClosingConfirmation: enable, disableClosingConfirmation: disable, requestFullscreen },
-    },
-  });
-  return { enable, disable, requestFullscreen };
-}
-
-const mobilePlatforms = ['ios', 'android', 'android_x'];
-const desktopPlatforms = ['tdesktop', 'macos', 'web', undefined];
-
-describe('telegramClosingConfirmation', () => {
-  afterEach(() => vi.unstubAllGlobals());
-
-  it('arms the close guard on mobile clients', () => {
-    for (const p of mobilePlatforms) {
-      const { enable } = stubClient(p);
-      telegramClosingConfirmation(true);
-      expect(enable, `platform=${p}`).toHaveBeenCalledOnce();
-    }
-  });
-
-  it('skips the close guard on desktop clients (the dialog there is just noise)', () => {
-    for (const p of desktopPlatforms) {
-      const { enable } = stubClient(p);
-      telegramClosingConfirmation(true);
-      expect(enable, `platform=${p}`).not.toHaveBeenCalled();
-    }
-  });
-
-  it('always lifts the guard on leave, regardless of platform', () => {
-    const { disable } = stubClient('tdesktop');
-    telegramClosingConfirmation(false);
-    expect(disable).toHaveBeenCalledOnce();
-  });
-});
-
-describe('telegramRequestFullscreen', () => {
-  afterEach(() => vi.unstubAllGlobals());
-
-  it('goes immersive fullscreen on mobile clients', () => {
-    for (const p of mobilePlatforms) {
-      const { requestFullscreen } = stubClient(p);
-      telegramRequestFullscreen();
-      expect(requestFullscreen, `platform=${p}`).toHaveBeenCalledOnce();
-    }
-  });
-
-  it('leaves desktop clients as a standard window (the bot full-size setting fills it)', () => {
-    for (const p of desktopPlatforms) {
-      const { requestFullscreen } = stubClient(p);
-      telegramRequestFullscreen();
-      expect(requestFullscreen, `platform=${p}`).not.toHaveBeenCalled();
-    }
-  });
-});
-
 describe('telegramOpenExternalLink', () => {
   afterEach(() => vi.unstubAllGlobals());
 
@@ -155,3 +93,106 @@ describe('routeExternalLinkInTelegram', () => {
     expect(routeExternalLinkInTelegram({ href: 'https://x.io', target: '_blank' })).toBe(false);
   });
 });
+
+describe('collectTelegramDiag', () => {
+  afterEach(() => vi.unstubAllGlobals());
+
+  it('reports a missing SDK outside Telegram', () => {
+    const d = collectTelegramDiag();
+    expect(d.hasSDK).toBe(false);
+    expect(d.hasWebApp).toBe(false);
+    expect(d.initDataLen).toBe(0);
+    expect(d.fieldsPresent).toEqual([]);
+    expect(d.fieldsMissing).toEqual(['user', 'auth_date', 'hash', 'signature']);
+  });
+
+  it('reads field NAMES (never values) from a non-empty initData', () => {
+    stubWebApp('query_id=abc&user=%7B%7D&auth_date=1&hash=deadbeef');
+    const d = collectTelegramDiag();
+    expect(d.hasSDK).toBe(true);
+    expect(d.hasWebApp).toBe(true);
+    expect(d.initDataLen).toBeGreaterThan(0);
+    expect(d.fieldsPresent).toEqual(['query_id', 'user', 'auth_date', 'hash']);
+    expect(d.fieldsMissing).toEqual(['signature']);
+  });
+
+  it('recovers field names from the URL fragment when the SDK left initData empty', () => {
+    // Telegram passed launch data in the fragment, but WebApp.initData is empty (the Android
+    // failure this screen diagnoses): the names come from the raw fragment instead, and
+    // hashHadTgData flags that the data did arrive in the URL.
+    vi.stubGlobal('window', { Telegram: { WebApp: { initData: '', platform: 'android' } } });
+    vi.stubGlobal('location', {
+      hash: '#tgWebAppData=user%3D%257B%257D%26auth_date%3D1%26hash%3Ddeadbeef&tgWebAppVersion=7.0',
+      pathname: '/telegram/',
+    });
+    const d = collectTelegramDiag();
+    expect(d.hasSDK).toBe(true);
+    expect(d.platform).toBe('android');
+    expect(d.initDataLen).toBe(0);
+    expect(d.hashHadTgData).toBe(true);
+    expect(d.fieldsPresent).toEqual(['user', 'auth_date', 'hash']);
+    expect(d.fieldsMissing).toEqual(['signature']);
+  });
+});
+
+describe('loadTelegramSDK', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+    vi.useRealTimers();
+  });
+
+  it('resolves true and records "present" when the SDK is already there', async () => {
+    vi.stubGlobal('window', { Telegram: { WebApp: { initData: '' } } });
+    vi.stubGlobal('document', { createElement: vi.fn(), head: { appendChild: vi.fn() } });
+    await expect(loadTelegramSDK(10000)).resolves.toBe(true);
+    expect(telegramSdkOutcome()).toBe('present');
+  });
+
+  it('records "loaded" when the script defines the WebApp', async () => {
+    const script: Record<string, unknown> = {};
+    vi.stubGlobal('window', {});
+    vi.stubGlobal('document', {
+      createElement: () => script,
+      head: {
+        appendChild: () => {
+          (window as unknown as { Telegram: unknown }).Telegram = { WebApp: { initData: '' } };
+          (script.onload as () => void)();
+        },
+      },
+    });
+    await expect(loadTelegramSDK(10000)).resolves.toBe(true);
+    expect(telegramSdkOutcome()).toBe('loaded');
+  });
+
+  it('records "no-webapp" when the script loads but defines nothing', async () => {
+    const script: Record<string, unknown> = {};
+    vi.stubGlobal('window', {});
+    vi.stubGlobal('document', {
+      createElement: () => script,
+      head: { appendChild: () => (script.onload as () => void)() },
+    });
+    await expect(loadTelegramSDK(10000)).resolves.toBe(false);
+    expect(telegramSdkOutcome()).toBe('no-webapp');
+  });
+
+  it('records "error" when the script fails to load (telegram.org unreachable)', async () => {
+    const script: Record<string, unknown> = {};
+    vi.stubGlobal('window', {});
+    vi.stubGlobal('document', {
+      createElement: () => script,
+      head: { appendChild: () => (script.onerror as () => void)() },
+    });
+    await expect(loadTelegramSDK(10000)).resolves.toBe(false);
+    expect(telegramSdkOutcome()).toBe('error');
+  });
+
+  it('records "timeout" when the script neither loads nor fails in time', async () => {
+    vi.useFakeTimers();
+    vi.stubGlobal('window', {});
+    vi.stubGlobal('document', { createElement: () => ({}), head: { appendChild: vi.fn() } });
+    const p = loadTelegramSDK(10000);
+    await vi.advanceTimersByTimeAsync(10000);
+    await expect(p).resolves.toBe(false);
+    expect(telegramSdkOutcome()).toBe('timeout');
+  });
+});

ui/src/lib/telegram.ts

@@ -1,6 +1,7 @@
-// Telegram Mini App SDK access. The official telegram-web-app.js (loaded in
+// Telegram Mini App SDK access. The official telegram-web-app.js (loaded dynamically with a
-// index.html) exposes window.Telegram.WebApp; this wraps the subset the app uses:
+// timeout by loadTelegramSDK — not a render-blocking <script> in index.html, so a network that
-// launch detection, initData (for auth.telegram), the deep-link start parameter,
+// blocks telegram.org cannot hang the page) exposes window.Telegram.WebApp; this wraps the subset
+// the app uses: launch detection, initData (for auth.telegram), the deep-link start parameter,
 // theme params, and ready()/expand(). Every helper is safe to call outside Telegram.
 
 import type { TelegramThemeParams } from './theme';
@@ -9,14 +10,18 @@ interface TelegramWebApp {
   initData: string;
   initDataUnsafe?: { start_param?: string };
   platform?: string;
+  version?: string;
   themeParams?: TelegramThemeParams;
   colorScheme?: 'light' | 'dark';
   isFullscreen?: boolean;
+  isExpanded?: boolean;
+  viewportHeight?: number;
+  viewportStableHeight?: number;
+  exitFullscreen?: () => void;
   safeAreaInset?: { top: number; bottom: number; left: number; right: number };
   contentSafeAreaInset?: { top: number; bottom: number; left: number; right: number };
   ready?: () => void;
   expand?: () => void;
-  requestFullscreen?: () => void;
   openTelegramLink?: (url: string) => void;
   openLink?: (url: string) => void;
   onEvent?: (event: string, handler: () => void) => void;
@@ -24,14 +29,13 @@ interface TelegramWebApp {
   setBackgroundColor?: (color: string) => void;
   setBottomBarColor?: (color: string) => void;
   disableVerticalSwipes?: () => void;
-  enableClosingConfirmation?: () => void;
-  disableClosingConfirmation?: () => void;
   HapticFeedback?: {
     impactOccurred?: (style: string) => void;
     notificationOccurred?: (type: string) => void;
     selectionChanged?: () => void;
   };
   BackButton?: {
+    isVisible?: boolean;
     show?: () => void;
     hide?: () => void;
     onClick?: (cb: () => void) => void;
@@ -53,6 +57,72 @@ export function insideTelegram(): boolean {
   return !!w && typeof w.initData === 'string' && w.initData.length > 0;
 }
 
+// The ?NN suffix pins the Bot API SDK version Telegram serves (and busts the cache); keep it at the
+// version the official Mini Apps page currently recommends so newer client features (fullscreen,
+// safe-area insets, vertical-swipe guard, …) are available. Bump it when Telegram bumps theirs.
+const sdkScriptSrc = 'https://telegram.org/js/telegram-web-app.js?62';
+
+/**
+ * TelegramSdkOutcome records how the dynamic telegram-web-app.js load resolved, surfaced on the
+ * launch-error screen to tell the failure modes apart — notably 'error' / 'timeout', which mean the
+ * network could not reach telegram.org (the script blocked or hung):
+ *
+ *   not-attempted — loadTelegramSDK was never called (a plain web / native entry)
+ *   present       — window.Telegram.WebApp was already there (a cached load or native injection)
+ *   loaded        — the script loaded and defined window.Telegram.WebApp
+ *   no-webapp     — the script loaded (HTTP 200) but did not define window.Telegram.WebApp
+ *   error         — the script failed to load (telegram.org unreachable / blocked, a fast failure)
+ *   timeout       — the script neither loaded nor failed within the timeout (a blocked, hanging fetch)
+ */
+export type TelegramSdkOutcome = 'not-attempted' | 'present' | 'loaded' | 'no-webapp' | 'error' | 'timeout';
+
+let sdkLoadOutcome: TelegramSdkOutcome = 'not-attempted';
+
+/** telegramSdkOutcome returns how the last loadTelegramSDK attempt resolved (see TelegramSdkOutcome). */
+export function telegramSdkOutcome(): TelegramSdkOutcome {
+  return sdkLoadOutcome;
+}
+
+/**
+ * loadTelegramSDK injects the official telegram-web-app.js and resolves true once
+ * window.Telegram.WebApp is available, or false if the script errors or does not load within
+ * timeoutMs. It is loaded dynamically — not a render-blocking <script> in index.html — so a network
+ * that blocks telegram.org (common where Telegram itself reaches users only over a proxy) cannot
+ * hang the page and strand the app or the launch-error screen. Resolves true immediately when the
+ * SDK is already present (a cached load, or a future native injection); a fast connection failure
+ * resolves via the error event without waiting out the timeout, so the timeout only bounds a true
+ * hang.
+ */
+export function loadTelegramSDK(timeoutMs: number): Promise<boolean> {
+  if (typeof document === 'undefined') return Promise.resolve(false);
+  if (webApp()) {
+    sdkLoadOutcome = 'present';
+    return Promise.resolve(true);
+  }
+  return new Promise<boolean>((resolve) => {
+    let done = false;
+    const finish = (outcome: TelegramSdkOutcome): void => {
+      if (done) return;
+      done = true;
+      sdkLoadOutcome = outcome;
+      resolve(outcome === 'loaded');
+    };
+    const timer = setTimeout(() => finish(webApp() ? 'loaded' : 'timeout'), timeoutMs);
+    const s = document.createElement('script');
+    s.src = sdkScriptSrc;
+    s.async = true;
+    s.onload = () => {
+      clearTimeout(timer);
+      finish(webApp() ? 'loaded' : 'no-webapp');
+    };
+    s.onerror = () => {
+      clearTimeout(timer);
+      finish('error');
+    };
+    document.head.appendChild(s);
+  });
+}
+
 /**
  * telegramOpenLink opens a t.me link through the Mini App SDK, so Telegram navigates to
  * it natively (e.g. a bot chat) rather than spawning an in-app browser tab. Returns false
@@ -224,66 +294,6 @@ export function telegramHaptic(kind: Haptic): void {
   else h.impactOccurred?.(kind);
 }
 
-/**
- * isMobilePlatform reports whether the Mini App runs on a Telegram mobile client — iOS or
- * Android (the latter reported as 'android' by Telegram for Android and 'android_x' by
- * Telegram X). Desktop clients (tdesktop, macOS, web) report other values. Used to limit
- * mobile-only chrome such as the close guard and immersive fullscreen.
- */
-function isMobilePlatform(): boolean {
-  const p = webApp()?.platform;
-  return p === 'ios' || p === 'android' || p === 'android_x';
-}
-
-/**
- * telegramRequestFullscreen asks Telegram to open the Mini App in fullscreen (Bot API 8.0+),
- * but only on mobile clients — mirroring how Telegram's own Mini Apps go immersive on phones
- * while staying a standard window on desktop (where the bot's full-size setting already fills
- * the window). A no-op outside Telegram, on desktop, or on clients predating the method.
- */
-export function telegramRequestFullscreen(): void {
-  if (isMobilePlatform()) webApp()?.requestFullscreen?.();
-}
-
-/**
- * telegramClosingConfirmation toggles the confirmation Telegram shows when the user swipes
- * the Mini App closed — enabled during an active game so it is not lost by accident. The
- * guard is only armed on mobile clients: on desktop, closing a window is deliberate and
- * Telegram surfaces a "changes may not be saved" dialog that is just noise here (drafts
- * auto-save), so the confirmation is skipped there.
- */
-export function telegramClosingConfirmation(on: boolean): void {
-  const w = webApp();
-  if (on) {
-    if (isMobilePlatform()) w?.enableClosingConfirmation?.();
-  } else {
-    w?.disableClosingConfirmation?.();
-  }
-}
-
-let backHandler: (() => void) | null = null;
-
-/**
- * telegramBackButton shows or hides Telegram's native header back button, wiring its
- * click to onClick (replacing any previous handler). The app hides its own back chevron
- * inside Telegram so only the native control shows.
- */
-export function telegramBackButton(show: boolean, onClick?: () => void): void {
-  const b = webApp()?.BackButton;
-  if (!b) return;
-  if (backHandler) b.offClick?.(backHandler);
-  backHandler = null;
-  if (show) {
-    if (onClick) {
-      backHandler = onClick;
-      b.onClick?.(onClick);
-    }
-    b.show?.();
-  } else {
-    b.hide?.();
-  }
-}
-
 /**
  * startParamFromURL reads a startapp parameter from the page URL — a bot web_app
  * launch button carries the deep-link there rather than in initDataUnsafe.
@@ -302,6 +312,160 @@ export function onTelegramPath(): boolean {
   return location.pathname.startsWith('/telegram/');
 }
 
+/** hasLaunchFragment reports whether the URL fragment carries Telegram launch params (tgWebApp…),
+ *  the form Telegram appends when opening a Mini App — so the SDK is loaded for a Mini App opened
+ *  at the site root too, not only the /telegram/ path. */
+export function hasLaunchFragment(): boolean {
+  if (typeof location === 'undefined') return false;
+  return location.hash.includes('tgWebApp');
+}
+
+// --- Launch diagnostics (the /telegram/ entry without sign-in data) ---
+
+/** The initData fields a valid Telegram launch is expected to carry; their absence is the signal
+ *  the launch-error screen reports. Only field names are ever inspected, never their values. */
+const expectedInitDataFields = ['user', 'auth_date', 'hash', 'signature'];
+
+interface uaBrand {
+  brand: string;
+  version: string;
+}
+
+interface uaDataValue {
+  platform?: string;
+  mobile?: boolean;
+  brands?: uaBrand[];
+}
+
+/** uaData returns the User-Agent Client Hints object (Chromium only — notably the Android Telegram
+ *  webview), or undefined where it is unavailable (iOS / Safari / Firefox). */
+function uaData(): uaDataValue | undefined {
+  if (typeof navigator === 'undefined') return undefined;
+  return (navigator as unknown as { userAgentData?: uaDataValue }).userAgentData;
+}
+
+/** launchFragmentData returns the raw tgWebAppData carried in the URL fragment (the form Telegram
+ *  appends on launch), or '' when absent. With no SDK present a non-empty value means Telegram
+ *  delivered the data but telegram-web-app.js never ran to parse it. */
+function launchFragmentData(): string {
+  if (typeof location === 'undefined') return '';
+  const frag = location.hash.replace(/^#/, '');
+  if (!frag) return '';
+  try {
+    return new URLSearchParams(frag).get('tgWebAppData') ?? '';
+  } catch {
+    return '';
+  }
+}
+
+/** initDataFieldNames parses a Telegram initData (or raw fragment data) query string and returns
+ *  only its field NAMES — never the values, since the hash / signature are auth material. */
+function initDataFieldNames(raw: string): string[] {
+  if (!raw) return [];
+  try {
+    return [...new URLSearchParams(raw).keys()];
+  } catch {
+    return [];
+  }
+}
+
+/**
+ * TelegramDiag is a privacy-safe snapshot of why a Mini App launch lacked sign-in data, taken at
+ * the moment of failure and rendered on the launch-error screen so a stuck user can share it with
+ * the developer. It carries no secret values — only presence flags, client / OS identification and
+ * the field NAMES of the launch data, never the signed initData itself, and never an IP.
+ */
+export interface TelegramDiag {
+  /** Whether window.Telegram (the telegram-web-app.js script) is present at all. */
+  hasSDK: boolean;
+  /** Whether window.Telegram.WebApp is present. */
+  hasWebApp: boolean;
+  /** How the dynamic telegram-web-app.js load resolved (see TelegramSdkOutcome) — 'error' /
+   *  'timeout' mean telegram.org was unreachable, the prime suspect for an empty launch. */
+  sdkLoad: TelegramSdkOutcome;
+  /** Telegram's own platform string (ios | android | android_x | tdesktop | web | …), or ''. */
+  platform: string;
+  /** The Bot API version the client reports, or ''. */
+  version: string;
+  /** The length of WebApp.initData — 0 is the failure this screen reports. */
+  initDataLen: number;
+  /** Whether the URL fragment still carried tgWebAppData at launch; true with hasSDK false means
+   *  Telegram delivered the data but the SDK script did not load to parse it. */
+  hashHadTgData: boolean;
+  /** The field names present in the launch data (from initData, or the raw fragment when the SDK
+   *  left initData empty); values are never included. */
+  fieldsPresent: string[];
+  /** The expected field names absent from the launch data (a subset of expectedInitDataFields). */
+  fieldsMissing: string[];
+  /** The OS / platform per User-Agent Client Hints (else navigator.platform), e.g. 'Android', ''. */
+  osPlatform: string;
+  /** Whether the client reports itself mobile per Client Hints: 'yes' | 'no' | '' (unknown). */
+  mobile: string;
+  /** The browser brands + major versions per Client Hints (Chromium only), or ''. */
+  browser: string;
+  /** The full User-Agent string — the catch-all that also carries the OS version and webview build. */
+  userAgent: string;
+}
+
+/**
+ * collectTelegramDiag captures a TelegramDiag snapshot of the current launch state. Call it at the
+ * point a /telegram/ launch is found to lack sign-in data, so the snapshot reflects that moment —
+ * sign-in data arriving late would otherwise mask the failure.
+ */
+export function collectTelegramDiag(): TelegramDiag {
+  const w = webApp();
+  const sdk = typeof window !== 'undefined' && !!(window as unknown as { Telegram?: unknown }).Telegram;
+  const initData = w?.initData ?? '';
+  const fragData = initData ? '' : launchFragmentData();
+  const present = initDataFieldNames(initData || fragData);
+  const ua = uaData();
+  const navPlatform =
+    typeof navigator === 'undefined' ? '' : (navigator as unknown as { platform?: string }).platform ?? '';
+  return {
+    hasSDK: sdk,
+    hasWebApp: !!w,
+    sdkLoad: sdkLoadOutcome,
+    platform: w?.platform ?? '',
+    version: w?.version ?? '',
+    initDataLen: initData.length,
+    hashHadTgData: fragData.length > 0,
+    fieldsPresent: present,
+    fieldsMissing: expectedInitDataFields.filter((f) => !present.includes(f)),
+    osPlatform: ua?.platform ?? navPlatform,
+    mobile: ua?.mobile === undefined ? '' : ua.mobile ? 'yes' : 'no',
+    browser: (ua?.brands ?? []).map((b) => `${b.brand} ${b.version}`).join(', '),
+    userAgent: typeof navigator === 'undefined' ? '' : navigator.userAgent,
+  };
+}
+
+/**
+ * telegramChromeDiag returns a compact, privacy-safe readout of Telegram's viewport / chrome state
+ * (platform, version, fullscreen/expanded, viewport geometry, safe-area insets, SDK-load outcome,
+ * back-button state, UA). It feeds the hidden debug panel (components/DebugPanel), opened by tapping
+ * the header title ten times. No secrets: no initData values, no IP.
+ */
+export function telegramChromeDiag(): string {
+  const w = webApp();
+  if (!w) return 'no telegram';
+  const win = typeof window === 'undefined' ? undefined : window;
+  const scr = typeof screen === 'undefined' ? undefined : screen;
+  const vv = win?.visualViewport ?? undefined;
+  const bar = typeof document === 'undefined' ? null : (document.querySelector('.bar')?.getBoundingClientRect() ?? null);
+  const sa = w.safeAreaInset;
+  const csa = w.contentSafeAreaInset;
+  const n = (v: number | undefined): string => (v === undefined ? '—' : String(Math.round(v)));
+  return [
+    `platform: ${w.platform ?? '—'}  version: ${w.version ?? '—'}  scheme: ${w.colorScheme ?? '—'}`,
+    `isFullscreen: ${w.isFullscreen}  isExpanded: ${w.isExpanded}`,
+    `inTG: ${insideTelegram()}  sdkLoad: ${sdkLoadOutcome}  backPresent: ${!!w.BackButton}  backVisible: ${w.BackButton?.isVisible}`,
+    `innerH: ${n(win?.innerHeight)}  outerH: ${n(win?.outerHeight)}  screenH: ${n(scr?.height)}  availH: ${n(scr?.availHeight)}`,
+    `screenY: ${n(win?.screenY)}  vv.offTop: ${n(vv?.offsetTop)}  vv.h: ${n(vv?.height)}`,
+    `tgViewportH: ${n(w.viewportHeight)}  stableH: ${n(w.viewportStableHeight)}`,
+    `safeArea T/B: ${n(sa?.top)}/${n(sa?.bottom)}  contentSafe T/B: ${n(csa?.top)}/${n(csa?.bottom)}`,
+    `appHeader top/h: ${bar ? Math.round(bar.top) : '—'}/${bar ? Math.round(bar.height) : '—'}`,
+  ].join('\n');
+}
+
 // --- Login Widget (web sign-in for account linking) ---
 
 // The Login Widget is the web (non-Mini-App) Telegram sign-in. It is used only to

ui/src/screens/Friends.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
   import { onMount } from 'svelte';
+  import Modal from '../components/Modal.svelte';
   import { app, handleError, refreshNotifications, showToast } from '../lib/app.svelte';
   import { connection } from '../lib/connection.svelte';
   import { gateway } from '../lib/gateway';
@@ -16,6 +17,11 @@
   let robotBlocks = $state<RobotBlockEntry[]>([]);
   let code = $state<FriendCode | null>(null);
   let redeemInput = $state('');
+  // The friend row whose kebab actions are slid open, like the lobby list.
+  let revealedId = $state<string | null>(null);
+  // Pending confirmation targets: the friend account awaiting a block / unfriend confirm.
+  let blockTarget = $state<AccountRef | null>(null);
+  let unfriendTarget = $state<AccountRef | null>(null);
 
   async function load() {
     try {
@@ -52,6 +58,41 @@
   const blockUser = (id: string) => act(() => gateway.block(id));
   const unblock = (id: string) => act(() => gateway.unblock(id));
 
+  // toggleReveal slides one friend row open (closing any other), exposing its
+  // block / unfriend icon actions; tapping the same kebab again closes it.
+  function toggleReveal(id: string): void {
+    revealedId = revealedId === id ? null : id;
+  }
+
+  // confirmBlock / confirmUnfriend run the pending action once its modal is
+  // accepted, then clear the target and the revealed row.
+  function confirmBlock(): void {
+    const target = blockTarget;
+    blockTarget = null;
+    revealedId = null;
+    if (target) void blockUser(target.accountId);
+  }
+
+  function confirmUnfriend(): void {
+    const target = unfriendTarget;
+    unfriendTarget = null;
+    revealedId = null;
+    if (target) void remove(target.accountId);
+  }
+
+  // While a friend row is slid open, a tap anywhere outside its action buttons
+  // closes it again. Taps on a kebab are skipped so its own toggle stays in charge.
+  $effect(() => {
+    if (revealedId === null) return;
+    function onDown(e: PointerEvent) {
+      const el = e.target as Element | null;
+      if (el?.closest('.acts') || el?.closest('.kebab')) return;
+      revealedId = null;
+    }
+    window.addEventListener('pointerdown', onDown, true);
+    return () => window.removeEventListener('pointerdown', onDown, true);
+  });
+
   async function getCode() {
     try {
       code = await gateway.friendCodeIssue();
@@ -141,7 +182,7 @@
             {t('friends.codeHint')} · {t('friends.codeExpires', { time: codeTime(code.expiresAtUnix) })}
           </span>
           {#if tg}
-            <button type="button" class="link tgshare" onclick={() => shareInvite(tg)}>{t('friends.shareTelegram')}</button>
+            <button type="button" class="link" onclick={() => shareInvite(tg)}>{t('friends.shareTelegram')}</button>
           {/if}
         </div>
       {:else}
@@ -152,30 +193,39 @@
     {#if incoming.length}
       <section>
         <h3>{t('friends.incoming')}</h3>
+        <div class="list">
           {#each incoming as r (r.accountId)}
-          <div class="item">
+            <div class="rowwrap">
+              <div class="row">
                 <span class="who">{r.displayName}</span>
-            <span class="acts">
+                <span class="btns">
                   <button class="btn" onclick={() => respond(r.accountId, true)} disabled={!connection.online}>{t('friends.accept')}</button>
                   <button class="ghost" onclick={() => respond(r.accountId, false)} disabled={!connection.online}>{t('friends.decline')}</button>
                 </span>
               </div>
+            </div>
           {/each}
+        </div>
       </section>
     {/if}
 
     <section>
       <h3>{t('friends.yours')}</h3>
       {#if friends.length}
+        <div class="list">
           {#each friends as f (f.accountId)}
-          <div class="item">
+            <div class="rowwrap" class:revealed={revealedId === f.accountId}>
+              <div class="acts">
+                <button class="iconbtn" onclick={() => (blockTarget = f)} disabled={!connection.online} aria-label={t('friends.block')}>🚫</button>
+                <button class="iconbtn" onclick={() => (unfriendTarget = f)} disabled={!connection.online} aria-label={t('friends.unfriend')}>✖️</button>
+              </div>
+              <div class="row">
                 <span class="who">{f.displayName}</span>
-            <span class="acts">
+                <button class="kebab" onclick={() => toggleReveal(f.accountId)} aria-label={t('friends.actions')}>⋮</button>
-              <button class="ghost" onclick={() => remove(f.accountId)} disabled={!connection.online}>{t('friends.unfriend')}</button>
+              </div>
-              <button class="ghost danger" onclick={() => blockUser(f.accountId)} disabled={!connection.online}>{t('friends.block')}</button>
-            </span>
             </div>
           {/each}
+        </div>
       {:else}
         <p class="muted">{t('friends.none')}</p>
       {/if}
@@ -184,20 +234,49 @@
     {#if blocked.length || robotBlocks.length}
       <section>
         <h3>{t('friends.blockedList')}</h3>
+        <div class="list">
           {#each blocked as b (b.accountId)}
-          <div class="item">
+            <div class="rowwrap">
+              <div class="row">
                 <span class="who">{b.displayName}</span>
+                <span class="btns">
                   <button class="ghost" onclick={() => unblock(b.accountId)} disabled={!connection.online}>{t('friends.unblock')}</button>
+                </span>
+              </div>
             </div>
           {/each}
           {#each robotBlocks as r (r.id)}
-          <div class="item">
+            <div class="rowwrap">
+              <div class="row">
                 <span class="who">{r.displayName}</span>
+                <span class="btns">
                   <button class="ghost" onclick={() => unblock(r.id)} disabled={!connection.online}>{t('friends.unblock')}</button>
+                </span>
+              </div>
             </div>
           {/each}
+        </div>
       </section>
     {/if}
+
+    {#if blockTarget}
+      <Modal title={t('friends.blockConfirm')} onclose={() => (blockTarget = null)}>
+        <p class="confirm-name">{blockTarget.displayName}</p>
+        <div class="confirm-row">
+          <button class="cancel" onclick={() => (blockTarget = null)}>{t('common.cancel')}</button>
+          <button class="danger" onclick={confirmBlock} disabled={!connection.online}>{t('friends.block')}</button>
+        </div>
+      </Modal>
+    {/if}
+    {#if unfriendTarget}
+      <Modal title={t('friends.unfriendConfirm')} onclose={() => (unfriendTarget = null)}>
+        <p class="confirm-name">{unfriendTarget.displayName}</p>
+        <div class="confirm-row">
+          <button class="cancel" onclick={() => (unfriendTarget = null)}>{t('common.cancel')}</button>
+          <button class="danger" onclick={confirmUnfriend} disabled={!connection.online}>{t('friends.unfriend')}</button>
+        </div>
+      </Modal>
+    {/if}
   {/if}
 </div>
 
@@ -279,28 +358,76 @@
     padding: 4px 0;
     text-align: left;
   }
-  .item {
+  .list {
+    display: flex;
+    flex-direction: column;
+  }
+  /* One-line rows split by hairlines, mirroring the lobby list. */
+  .rowwrap {
+    position: relative;
+    overflow: hidden;
+  }
+  .rowwrap + .rowwrap {
+    border-top: 1px solid var(--border);
+  }
+  /* Block / unfriend icon actions sit behind the friend row, exposed when it slides left. */
+  .acts {
+    position: absolute;
+    inset: 0 0 0 auto;
+    display: flex;
+    align-items: stretch;
+  }
+  .iconbtn {
+    flex: 0 0 auto;
+    width: 48px;
+    border: none;
+    background: var(--bg-elev);
+    color: var(--text);
+    font-size: 1.1rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+  .iconbtn + .iconbtn {
+    border-left: 1px solid var(--border); /* the vertical divider between 🚫 and ✖️ */
+  }
+  .row {
+    position: relative;
     display: flex;
     align-items: center;
     justify-content: space-between;
     gap: 10px;
     padding: 10px 12px;
-    border: 1px solid var(--border);
+    background: var(--bg);
-    background: var(--surface);
+    transform: translateX(0);
-    border-radius: var(--radius-sm);
+    transition: transform 0.18s ease;
-    margin-bottom: 8px;
+  }
+  .rowwrap.revealed .row {
+    transform: translateX(-96px); /* 2 × 48px icon buttons */
+  }
+  .kebab {
+    flex: 0 0 auto;
+    width: 30px;
+    padding: 6px 0;
+    border: none;
+    background: none;
+    color: var(--text-muted);
+    font-size: 1.4rem;
+    line-height: 1;
+  }
+  .btns {
+    display: flex;
+    gap: 8px;
+    flex: 0 0 auto;
   }
   .who {
+    flex: 1;
+    min-width: 0;
     font-weight: 600;
     overflow: hidden;
     text-overflow: ellipsis;
     white-space: nowrap;
   }
-  .acts {
-    display: flex;
-    gap: 8px;
-    flex: 0 0 auto;
-  }
   .btn {
     padding: 8px 12px;
     border: 1px solid var(--accent);
@@ -315,7 +442,27 @@
     color: var(--text);
     border-radius: var(--radius-sm);
   }
-  .ghost.danger {
+  .confirm-name {
-    color: var(--danger, #c0392b);
+    margin: 0 0 12px;
+    font-weight: 600;
+    overflow-wrap: anywhere; /* a long display name wraps instead of stretching the sheet */
+  }
+  .confirm-row {
+    display: flex;
+    gap: 8px;
+  }
+  .confirm-row button {
+    flex: 1;
+    padding: 11px;
+    border-radius: var(--radius-sm);
+    border: 1px solid var(--border);
+    background: var(--surface);
+    color: var(--text);
+    font-weight: 600;
+  }
+  .confirm-row .danger {
+    background: var(--danger);
+    color: #fff;
+    border-color: var(--danger);
   }
 </style>

ui/src/screens/TelegramLaunchError.svelte

@@ -0,0 +1,133 @@
+<script lang="ts">
+  // Shown on the dedicated /telegram/ entry when a Mini App launch carried no sign-in data (empty
+  // initData) — instead of bouncing the visitor to the marketing landing. It states the problem
+  // plainly and renders a compact, privacy-safe diagnostic snapshot (taken at the moment of
+  // failure, app.launchError) sized to fit one screenshot, with a Share button (the OS share sheet,
+  // or a clipboard copy on desktop) so a stuck user can send it to the developer to pinpoint why
+  // Telegram provided no initData — notably on some Android clients. The snapshot carries only
+  // presence / identification signals and field NAMES, never the signed initData itself, nor an IP.
+  import { app, retryTelegramLaunch } from '../lib/app.svelte';
+  import { shareText } from '../lib/share';
+  import { t } from '../lib/i18n/index.svelte';
+
+  const diag = $derived(app.launchError);
+
+  // One compact "key: value" line per fact; the field labels are fixed diagnostic tokens (not UI
+  // prose), so the developer reads the same report in any locale. Kept terse to fit one screenshot.
+  const report = $derived(
+    diag
+      ? [
+          `sdk-load: ${diag.sdkLoad}`,
+          `sdk: ${diag.hasSDK ? 'yes' : 'no'}   webapp: ${diag.hasWebApp ? 'yes' : 'no'}`,
+          `tg-platform: ${diag.platform || '—'}   tg-version: ${diag.version || '—'}`,
+          `initData: ${diag.initDataLen > 0 ? diag.initDataLen : 'empty'}   tgdata-in-url: ${diag.hashHadTgData ? 'yes' : 'no'}`,
+          `fields: ${diag.fieldsPresent.join(',') || '—'}`,
+          `missing: ${diag.fieldsMissing.join(',') || '—'}`,
+          `os: ${diag.osPlatform || '—'}   mobile: ${diag.mobile || '—'}`,
+          `browser: ${diag.browser || '—'}`,
+          `ua: ${diag.userAgent || '—'}`,
+        ].join('\n')
+      : '',
+  );
+
+  let retrying = $state(false);
+  async function retry(): Promise<void> {
+    if (retrying) return;
+    retrying = true;
+    try {
+      await retryTelegramLaunch();
+    } finally {
+      retrying = false;
+    }
+  }
+
+  let copied = $state(false);
+  let copyTimer: ReturnType<typeof setTimeout> | undefined;
+  async function share(): Promise<void> {
+    const r = await shareText(report, t('launch.errorTitle'));
+    // The OS share sheet is its own feedback; a desktop clipboard copy is silent, so confirm it.
+    if (r === 'copied') {
+      copied = true;
+      clearTimeout(copyTimer);
+      copyTimer = setTimeout(() => (copied = false), 1500);
+    }
+  }
+</script>
+
+{#if diag}
+  <div class="boot">
+    <div class="card">
+      <h1>{t('launch.errorTitle')}</h1>
+      <p class="msg">{t('launch.errorBody')}</p>
+      <pre class="diag">{report}</pre>
+      <div class="actions">
+        <button class="share" onclick={share}>{copied ? t('launch.copied') : t('launch.share')}</button>
+        <button class="retry" onclick={retry} disabled={retrying}>{t('common.retry')}</button>
+      </div>
+    </div>
+  </div>
+{/if}
+
+<style>
+  .boot {
+    height: 100%;
+    display: grid;
+    place-items: center;
+    padding: 16px;
+    background: var(--bg);
+  }
+  .card {
+    max-width: 32rem;
+    width: 100%;
+    display: flex;
+    flex-direction: column;
+    gap: 0.6rem;
+    text-align: center;
+    color: var(--text);
+  }
+  h1 {
+    margin: 0;
+    font-size: 1.1rem;
+  }
+  .msg {
+    margin: 0;
+    color: var(--text-muted);
+    font-size: 0.9rem;
+  }
+  .diag {
+    margin: 0;
+    text-align: left;
+    white-space: pre-wrap;
+    overflow-wrap: anywhere;
+    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+    font-size: 11px;
+    line-height: 1.4;
+    color: var(--text);
+    background: var(--bg-elev);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-sm);
+    padding: 8px 10px;
+  }
+  .actions {
+    display: flex;
+    justify-content: center;
+    gap: 0.5rem;
+  }
+  .share,
+  .retry {
+    padding: 8px 16px;
+    border-radius: var(--radius-sm);
+    border: 1px solid var(--accent);
+  }
+  .share {
+    background: var(--accent);
+    color: var(--accent-text);
+  }
+  .retry {
+    background: transparent;
+    color: var(--accent);
+  }
+  .retry:disabled {
+    opacity: 0.5;
+  }
+</style>