Merge pull request 'release v1.5.1: support-relay card + topic-reopen fixes' (#133) from development into master

Telegram silently routes a copyMessage aimed at a deleted forum topic
into the chat's General topic with NO error, so the bot's error-based
recreate never fired — the user's next message landed in General with no
card. Confirmed against the prod bot logs: a relay after a topic deletion
logged neither "relay to topic failed" nor "topic gone, reopening".

Probe topic liveness before reusing it: re-applying the info card's reply
markup is a no-op that errors only when the card (hence the topic) is
gone, so the bot detects the deletion and reopens the topic + card rather
than relying on the (absent) copy error. The post-copy recreate stays as
a race backstop.

.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'

deploy/.env.example

@@ -47,6 +47,7 @@ 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

deploy/docker-compose.bot.yml

@@ -23,6 +23,11 @@ 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:-}
@@ -46,8 +51,13 @@ 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:

docs/ARCHITECTURE.md

@@ -1200,3 +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

@@ -272,6 +272,15 @@ 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

@@ -278,6 +278,15 @@ 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

@@ -97,14 +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
-  Telegram); **HapticFeedback** fires on tile placement / commit / error; on **mobile**
-  clients the app enters **immersive fullscreen** on launch (`requestFullscreen`, Bot API
-  8.0+) like Telegram's own Mini Apps, while desktop keeps the bot's full-size window;
-  **closing confirmation** is enabled while a game is open **on mobile only** (on desktop
-  closing is deliberate and the "changes may not be saved" dialog is just noise — move drafts
-  auto-save); **vertical swipes** (swipe-to-minimise)
-  are disabled so they don't fight tile drag or the board scroll; **external links** (the word-check
+  app's **own back chevron** (Header) drives back-navigation on every platform — the native
+  Telegram BackButton is not used, as it does not render reliably in the windowed Mini App;
+  **HapticFeedback** fires on tile placement / commit / error; the app calls `expand()` for the
+  bot's full-size (max-height) window but **never `requestFullscreen`** — immersive fullscreen hid
+  the native header (and its BackButton) and the Android system swipe-back then minimised the app,
+  so it stays windowed with Telegram's thin native header (close) above the app's own header; move
+  drafts auto-save, so there is **no closing-confirmation guard**; a hidden **debug panel** (ten
+  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

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

@@ -63,6 +63,20 @@ 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
@@ -132,6 +146,8 @@ 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 |

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
@@ -128,6 +145,7 @@ 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
-		// 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{
+		allowed := 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
@@ -135,6 +145,7 @@ 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"),
+		SupportStateDir:   envOr("TELEGRAM_SUPPORT_STATE_DIR", "/data"),
 		LogLevel:          envOr("TELEGRAM_LOG_LEVEL", "info"),
 		BotLink: BotLinkClientConfig{
 			GatewayAddr: os.Getenv("TELEGRAM_GATEWAY_ADDR"),
@@ -152,6 +163,9 @@ 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/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/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';
@@ -30,19 +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
@@ -138,6 +125,10 @@
   <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's own chevron is hidden to avoid two back affordances.
-  const showBack = $derived(!!back && !insideTelegram());
+  // The app always shows its own back chevron when there is a back target — on every platform, in
+  // and out of Telegram. The native Telegram BackButton is not used: it does not render reliably in
+  // 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}

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

@@ -25,7 +25,6 @@ import {
   telegramLaunch,
   type TelegramLaunch,
   telegramOnEvent,
-  telegramRequestFullscreen,
   telegramSetChrome,
 } from './telegram';
 import { parseStartParam } from './deeplink';
@@ -56,6 +55,9 @@ export const app = $state<{
    *  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;
@@ -106,6 +108,7 @@ export const app = $state<{
   ready: false,
   bootError: false,
   launchError: null,
+  debugOpen: false,
   lobbyReady: false,
   splashDone: false,
   streamAlive: false,
@@ -197,6 +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
@@ -557,10 +570,6 @@ function applyTelegramChrome(launch: TelegramLaunch): void {
   syncTelegramChrome();
   syncTelegramSafeArea();
   telegramDisableVerticalSwipes();
-  // On mobile, go immersive fullscreen like Telegram's own Mini Apps; the fullscreenChanged
-  // listener (registered at bootstrap) 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();
 }
 
 /** How long to wait for the dynamically loaded Telegram Mini App SDK before giving up and showing

ui/src/lib/telegram.test.ts

@@ -5,10 +5,8 @@ import {
   loadTelegramSDK,
   telegramSdkOutcome,
   routeExternalLinkInTelegram,
-  telegramClosingConfirmation,
   telegramLaunch,
   telegramOpenExternalLink,
-  telegramRequestFullscreen,
 } from './telegram';
 
 function stubWebApp(initData: string, startParam?: string) {
@@ -48,69 +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());
 

ui/src/lib/telegram.ts

@@ -14,11 +14,14 @@ interface TelegramWebApp {
   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;
@@ -26,14 +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;
@@ -292,66 +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.
@@ -496,6 +438,34 @@ export function collectTelegramDiag(): TelegramDiag {
   };
 }
 
+/**
+ * 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