feat(ui): first-run onboarding coachmarks

A one-time coachmark overlay walks a new player through the lobby and their
first game board: a light dimmed layer draws one tail-pointed hint bubble at a
time, advancing on a tap anywhere and removing itself for good after the last
hint. Two independent series (lobby: settings/stats/new game; game:
header/pass-exchange/hints/shuffle/rack), gated by a per-device persisted flag
and marked done only after the last hint, so an interrupted run replays from
the start. A deep-link into Settings -> Friends still triggers the lobby series
on the first trip back to the lobby.

Targets carry a data-coach attribute, so one positioning engine anchors the
bubble in both portrait and landscape, re-measuring each frame until the
geometry settles (route slide, hidden-banner reflow, fonts). The promo banner
hides while the overlay is up (app.coachActive); a hidden DebugPanel "Reset
visited" control replays the walk-through. Off by default in the mock build so
the Playwright smoke is unaffected; ?coach forces it on for the dedicated e2e.

Pure geometry (step lists, nextVisibleStep, placeBubble) in lib/coachmark.ts
(unit-tested); Coachmark.svelte renders. Docs: FUNCTIONAL(+ru) onboarding
story, UI_DESIGN coachmark section.

docs/FUNCTIONAL.md

@@ -25,6 +25,20 @@ theme, and links to the matching per-language Telegram channel; the game itself
 `/app/` (web), `/telegram/` (the Telegram Mini App) and `/vk/` (the VK Mini App). The landing's theme is ephemeral
 (it follows the system scheme, not the saved preference); its language choice is saved.
 
+### First-run onboarding
+The first time a player opens the app it walks them through the interface with a light
+**coachmark overlay**: a dimmed layer draws one hint bubble at a time, each pointing — with a
+tail — at a real control, and a **tap anywhere** advances to the next; after the last hint the
+overlay is gone for good. Two independent series run. The **lobby** series points at the
+⚙️ settings, ✏️ statistics and 🎲 new-game tabs. The **game** series, on the player's first game
+board, points at the scoreboard header (move history / chat / word-check), the 🔄 pass-and-exchange,
+🛟 hints and 🔀 shuffle controls, and the rack. A series counts as seen only **after its last hint**,
+so leaving mid-way replays it from the start next time; it is remembered per device. Arriving at the
+lobby is the lobby trigger, so a player who deep-links straight into Settings → Friends still gets the
+lobby walk-through on their first trip back. Both series work the same in portrait and landscape (the
+bubbles re-anchor to wherever the controls move) and the hint texts are localized (en/ru). The
+advertising banner hides while the overlay is up and returns when it closes.
+
 ### Identity & sessions
 A player arrives from a platform (Telegram first), via email login, or as an
 ephemeral guest. The gateway validates the credential once and mints a thin

docs/FUNCTIONAL_ru.md

@@ -26,6 +26,21 @@ top-1 подсказку, безлимитную проверку слова с
 `/app/` (веб), `/telegram/` (Telegram Mini App) и `/vk/` (VK Mini App). Тема на странице эфемерна (берётся из
 системной настройки, а не из сохранённой), выбор языка сохраняется.
 
+### Первый запуск: онбординг
+При первом открытии приложения игрока один раз проводят по интерфейсу лёгким
+**coachmark-оверлеем**: затемнённый слой показывает по одной подсказке-«облачку» за раз, каждое
+«хвостиком» указывает на реальный элемент управления, а **тап в любом месте** переходит к
+следующей; после последней подсказки оверлей убирается навсегда. Серий две. Серия **лобби**
+указывает на вкладки ⚙️ настроек, ✏️ статистики и 🎲 новой игры. Серия **игры**, на первой партии
+игрока, указывает на шапку со счётом (история ходов / чат / проверка слова), кнопки 🔄 пас-и-обмен,
+🛟 подсказок и 🔀 перемешивания, и на стойку с фишками. Серия считается просмотренной только
+**после последней подсказки**, поэтому выход на середине в следующий раз покажет её с начала;
+запоминается она по устройству. Триггер серии лобби — попадание в лобби, так что игрок, пришедший
+по deeplink сразу в Настройки → Друзья, всё равно получит проводку по лобби при первом возврате.
+Обе серии одинаково работают в portrait и landscape (облачка переустанавливаются туда, куда
+переезжают элементы), тексты подсказок локализованы (en/ru). Рекламный баннер скрывается, пока
+оверлей показан, и возвращается по закрытию.
+
 ### Личность и сессии
 Игрок приходит с платформы (сначала Telegram), через email-вход или как
 эфемерный гость. Gateway один раз валидирует доступ и выдаёт тонкий

docs/UI_DESIGN.md

@@ -49,6 +49,32 @@ fast load shows it for ~1.25 s. Each tile **drops in** with a brief scale + fade
 dismisses as soon as the lobby is ready. The pure layout and timing live in `lib/splash.ts`
 (unit-tested); `Splash.svelte` is the renderer.
 
+## First-run onboarding coachmarks (`components/Coachmark.svelte`, `lib/coachmark.ts`)
+
+A one-time **coachmark overlay** introduces the interface to a new player. Like the splash it is an
+**App-level overlay**; it runs two independent series chosen by the route — **lobby** (⚙️ settings →
+✏️ stats → 🎲 new game) and **game** (scoreboard header → 🔄 pass/exchange → 🛟 hints → 🔀 shuffle →
+rack). It draws **one bubble at a time** over a light scrim (`rgba(0,0,0,0.32)`); the whole layer
+captures pointer events, so a **tap anywhere advances** and the UI underneath stays inert. After the
+last hint the series is recorded done (`session.ts` `onboarding` key) and the overlay removes itself;
+a series is marked only after its **last** hint, so an interrupted player replays it from the start.
+The lobby series gates on `app.splashDone`, the game series on its first target laying out; both defer
+while a modal (`welcomeRedeem` / `staleInvite`) is open.
+
+Each target carries a **`data-coach` attribute**, so the **same positioning engine anchors it in both
+orientations** wherever the layout moves it (the tab bar to the landscape left panel, etc.). The
+bubble points at the live `getBoundingClientRect()` of its target, **re-measuring each frame until the
+geometry settles** (the route-change slide, the hidden-banner reflow, async fonts) and on resize /
+rotation; a target absent in the current state is skipped. The bubble matches the in-game counter text
+size (`0.85rem`, larger in landscape), wraps by word and never fills the width; its **tail** sits on
+the edge facing the target, centred on it (clamped near a corner). The pure geometry (step lists,
+`nextVisibleStep`, `placeBubble`) lives in `lib/coachmark.ts` (unit-tested); `Coachmark.svelte` is the
+renderer. While the overlay is up the **advertising banner is hidden** (`app.coachActive`) so its
+scroll does not run behind the scrim. The hidden DebugPanel offers a **Reset visited** control that
+clears the flags so the walk-through replays on the next launch. In the **mock build** the overlay
+does not auto-show (so it cannot block the Playwright smoke); `?coach` forces it on for the dedicated
+e2e and the screenshots.
+
 ## Navigation
 
 - **Back**: a thin, compact `<` drawn from two rotated CSS borders (`Header.svelte`
@@ -253,7 +279,8 @@ the surroundings in the light theme and a touch lighter in the dark theme, mappe
 linkified). It is **server-driven**: the campaigns and display timings ride the `profile.get`
 response (`app.profile.banner`, present only for an eligible viewer — see ARCHITECTURE §10), so
 `Header` renders the strip only when that block is present, and a `notify` `banner` event re-fetches
-the profile to show or hide it in place.
+the profile to show or hide it in place. It is also hidden while a first-run onboarding overlay is up
+(`app.coachActive`), reappearing by this same condition once the overlay closes.
 
 The rotation runs in a **persistent module engine** (`lib/bannerEngine`): the scheduler and timer
 live outside the components, so navigating between screens (which remounts the view) **continues the

ui/e2e/onboarding.spec.ts

@@ -0,0 +1,48 @@
+import { expect, test, type Page } from './fixtures';
+
+// The first-run onboarding coachmarks. `?coach` forces the overlay on in the mock build (where it
+// is otherwise off so it cannot eat the smoke's taps) and bypasses the persisted "seen" flag, so
+// the series replay deterministically here. A tap anywhere on the overlay advances; after the last
+// hint the overlay removes itself.
+
+// Tap the overlay near a corner (clear of the bubble) to advance to the next hint.
+async function advance(page: Page): Promise<void> {
+  await page.locator('[data-coach-overlay]').click({ position: { x: 5, y: 5 } });
+}
+
+// Drive both series end to end: guest login -> lobby coachmarks (3) -> open the seeded game ->
+// game coachmarks (5) -> gone. Shared by the portrait and landscape projects/cases.
+async function runOnboarding(page: Page): Promise<void> {
+  const overlay = page.locator('[data-coach-overlay]');
+
+  await page.goto('/?coach=1');
+  await page.getByRole('button', { name: /guest/i }).click();
+
+  // Lobby series: settings -> stats -> new game.
+  await expect(overlay).toBeVisible({ timeout: 10000 });
+  await advance(page);
+  await advance(page);
+  await advance(page);
+  await expect(overlay).toBeHidden();
+
+  // The lobby is interactive again: open the seeded active game.
+  await page.getByRole('button', { name: /Ann/ }).click();
+  await expect(page.locator('[data-cell]').first()).toBeVisible();
+
+  // Game series: header -> pass/exchange -> hints -> shuffle -> rack.
+  await expect(overlay).toBeVisible({ timeout: 10000 });
+  for (let i = 0; i < 5; i++) await advance(page);
+  await expect(overlay).toBeHidden();
+}
+
+test('onboarding walks the lobby then the first game (portrait)', async ({ page }) => {
+  await runOnboarding(page);
+});
+
+test.describe('landscape', () => {
+  test.use({ viewport: { width: 1100, height: 640 } });
+
+  test('onboarding anchors and advances in the wide layout', async ({ page }) => {
+    await runOnboarding(page);
+  });
+});

ui/src/App.svelte

@@ -8,6 +8,7 @@
   import Splash from './components/Splash.svelte';
   import StaleInviteModal from './components/StaleInviteModal.svelte';
   import WelcomeRedeemModal from './components/WelcomeRedeemModal.svelte';
+  import Coachmark from './components/Coachmark.svelte';
   import DebugPanel from './components/DebugPanel.svelte';
   import Login from './screens/Login.svelte';
   import Lobby from './screens/Lobby.svelte';
@@ -120,6 +121,7 @@
 <Toast />
 <StaleInviteModal />
 <WelcomeRedeemModal />
+<Coachmark />
 
 {#if routeIsLobby && !app.splashDone && !app.blocked && !app.bootError && !app.launchError}
   <Splash />

ui/src/components/Coachmark.svelte

@@ -0,0 +1,330 @@
+<script lang="ts">
+  // First-run onboarding coachmarks: a light dimmed overlay that points one bubble at a time at a
+  // real UI element (a tab-bar button, the scoreboard, the rack), advancing on a tap anywhere and
+  // removing itself for good after the last hint. Two independent series — the lobby (just
+  // registered) and the first game board — selected by the current route. The geometry lives in
+  // lib/coachmark (unit-tested); this component supplies the live target rectangles, drives the
+  // step machine, and persists completion. Targets are found by their `data-coach` attribute, so
+  // the same code anchors them in portrait and landscape, wherever the layout puts them.
+  import { onDestroy } from 'svelte';
+  import { app, markOnboardingDone } from '../lib/app.svelte';
+  import { router } from '../lib/router.svelte';
+  import { t } from '../lib/i18n/index.svelte';
+  import { nextVisibleStep, placeBubble, stepsFor, type CoachSeries, type Placement } from '../lib/coachmark';
+
+  // In the mock build the overlay never auto-shows (so the Playwright smoke is not held up by an
+  // overlay that intercepts taps — like the splash). `?coach` forces it on regardless, bypassing
+  // both the mock gate and the "already seen" flag, for screenshots and the dedicated e2e.
+  const isMock = import.meta.env.MODE === 'mock';
+  const forced = typeof location !== 'undefined' && new URLSearchParams(location.search).has('coach');
+
+  // How long to wait for the first target of a series to lay out before giving up (the game board
+  // mounts asynchronously once its state loads).
+  const READY_BUDGET_MS = 8000;
+
+  let activeSeries = $state<CoachSeries | null>(null);
+  let stepIndex = $state(-1);
+  let placement = $state<Placement | null>(null);
+  let bubbleEl = $state<HTMLElement>();
+  // Series already completed in this page session. The persisted flag stops a series from
+  // replaying in real use, but `?coach` deliberately bypasses that flag — so this stops a forced
+  // series from immediately restarting itself the moment it finishes.
+  const sessionDone = new Set<CoachSeries>();
+
+  // Viewport + a generic "layout changed" tick (resize, rotation, scroll, the banner reflow) that
+  // re-runs the measuring effect so a bubble keeps pointing at its target.
+  let vw = $state(0);
+  let vh = $state(0);
+  let tick = $state(0);
+  let pollId = 0;
+
+  function seriesFor(name: string): CoachSeries | null {
+    return name === 'lobby' ? 'lobby' : name === 'game' ? 'game' : null;
+  }
+  function seriesRoute(series: CoachSeries): string {
+    return series === 'lobby' ? 'lobby' : 'game';
+  }
+  function targetEl(target: string): HTMLElement | null {
+    return typeof document === 'undefined' ? null : document.querySelector<HTMLElement>(`[data-coach="${target}"]`);
+  }
+  function present(target: string): boolean {
+    const el = targetEl(target);
+    if (!el) return false;
+    const r = el.getBoundingClientRect();
+    return r.width > 0 && r.height > 0;
+  }
+  function blockedByModal(): boolean {
+    return app.welcomeRedeem || app.staleInvite || app.blocked != null || app.bootError || app.launchError != null;
+  }
+  function eligible(series: CoachSeries): boolean {
+    if (sessionDone.has(series)) return false;
+    const done = series === 'lobby' ? app.onboarding.lobbyDone : app.onboarding.gameDone;
+    if (!(forced || (!isMock && !done))) return false;
+    if (blockedByModal()) return false;
+    // The lobby waits for the loading splash to clear; the game waits for its first target (below).
+    if (series === 'lobby') return app.splashDone;
+    return true;
+  }
+
+  function maybeStart(series: CoachSeries): void {
+    if (activeSeries || !eligible(series)) return;
+    const i = nextVisibleStep(stepsFor(series), 0, present);
+    if (i < 0) return; // targets not on screen yet — the poll keeps trying
+    activeSeries = series;
+    stepIndex = i;
+    app.coachActive = true;
+    tick++;
+  }
+
+  function advance(): void {
+    if (!activeSeries) return;
+    const i = nextVisibleStep(stepsFor(activeSeries), stepIndex + 1, present);
+    if (i < 0) {
+      finish();
+      return;
+    }
+    stepIndex = i;
+    tick++;
+  }
+  function finish(): void {
+    if (activeSeries) {
+      sessionDone.add(activeSeries);
+      markOnboardingDone(activeSeries);
+    }
+    reset();
+  }
+  function reset(): void {
+    activeSeries = null;
+    stepIndex = -1;
+    placement = null;
+    app.coachActive = false;
+    cancelPoll();
+  }
+  function cancelPoll(): void {
+    if (pollId) {
+      cancelAnimationFrame(pollId);
+      pollId = 0;
+    }
+  }
+  function startPoll(series: CoachSeries): void {
+    cancelPoll();
+    const t0 = performance.now();
+    const loop = (): void => {
+      pollId = 0;
+      if (activeSeries || seriesFor(router.route.name) !== series) return;
+      maybeStart(series);
+      if (activeSeries || performance.now() - t0 > READY_BUDGET_MS) return;
+      pollId = requestAnimationFrame(loop);
+    };
+    pollId = requestAnimationFrame(loop);
+  }
+
+  // Orchestration: pick the series for the route, stop one left behind, and (re)try on every change
+  // to a flag that gates eligibility (splash, modals, blocked, the seen flags). A bounded poll
+  // covers the asynchronous appearance of the first target.
+  $effect(() => {
+    const name = router.route.name;
+    // Touch the reactive eligibility inputs so this re-runs when they change.
+    void app.splashDone;
+    void app.welcomeRedeem;
+    void app.staleInvite;
+    void app.blocked;
+    void app.bootError;
+    void app.launchError;
+    void app.onboarding.lobbyDone;
+    void app.onboarding.gameDone;
+
+    const series = seriesFor(name);
+    if (activeSeries && seriesRoute(activeSeries) !== name) reset();
+    cancelPoll();
+    if (!series) return;
+    maybeStart(series);
+    if (!activeSeries) startPoll(series);
+  });
+
+  // While a series is active, track viewport size and any layout shift so the bubble re-anchors
+  // (rotation, the hidden banner reflow, async fonts). Scroll is observed in the capture phase to
+  // catch inner scrollers. Attached only when active so the always-mounted component adds no
+  // global listeners while idle.
+  $effect(() => {
+    if (!activeSeries || typeof window === 'undefined') return;
+    vw = window.innerWidth;
+    vh = window.innerHeight;
+    const onResize = (): void => {
+      vw = window.innerWidth;
+      vh = window.innerHeight;
+      tick++;
+    };
+    const onLayout = (): void => void tick++;
+    window.addEventListener('resize', onResize);
+    window.addEventListener('orientationchange', onResize);
+    window.addEventListener('scroll', onLayout, true);
+    const ro = new ResizeObserver(onLayout);
+    ro.observe(document.body);
+    return () => {
+      window.removeEventListener('resize', onResize);
+      window.removeEventListener('orientationchange', onResize);
+      window.removeEventListener('scroll', onLayout, true);
+      ro.disconnect();
+    };
+  });
+
+  // Measure the active target and place the bubble, re-measuring each frame until the geometry holds
+  // steady. The route-change slide, the hidden-banner reflow and async fonts all move the target
+  // after the step first renders, so a single measurement can land the bubble at a mid-animation
+  // position; settling fixes that. The bubble is laid out off-screen first so its real size is
+  // known, and a vanished target is skipped.
+  $effect(() => {
+    void vw;
+    void vh;
+    void tick;
+    const series = activeSeries;
+    const i = stepIndex;
+    if (!series || i < 0) {
+      placement = null;
+      return;
+    }
+    const target = stepsFor(series)[i].target;
+    let raf = 0;
+    let stableSig = '';
+    let stableMs = 0;
+    let totalMs = 0;
+    const measure = (): void => {
+      const el = targetEl(target);
+      const r = el?.getBoundingClientRect();
+      if (!r || r.width === 0 || r.height === 0) {
+        advance();
+        return;
+      }
+      const bb = bubbleEl?.getBoundingClientRect();
+      const size = bb && bb.width ? { width: bb.width, height: bb.height } : { width: 280, height: 80 };
+      placement = placeBubble(
+        { left: r.left, top: r.top, width: r.width, height: r.height },
+        { width: window.innerWidth, height: window.innerHeight },
+        size,
+      );
+      // Re-measure until the target rect + bubble size hold steady for a short spell (so the bubble
+      // lands at the post-animation position), bounded by a hard cap as a safety net.
+      const sig = `${Math.round(r.left)}:${Math.round(r.top)}:${Math.round(r.width)}:${Math.round(r.height)}:${Math.round(size.width)}`;
+      if (sig === stableSig) stableMs += 16;
+      else {
+        stableSig = sig;
+        stableMs = 0;
+      }
+      totalMs += 16;
+      if (stableMs < 320 && totalMs < 2500) raf = requestAnimationFrame(measure);
+    };
+    raf = requestAnimationFrame(measure);
+    return () => cancelAnimationFrame(raf);
+  });
+
+  onDestroy(() => {
+    cancelPoll();
+    if (activeSeries) app.coachActive = false;
+  });
+</script>
+
+{#if activeSeries && stepIndex >= 0}
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div class="coach" data-coach-overlay onclick={advance}>
+    <div
+      class="bubble"
+      class:shown={!!placement}
+      bind:this={bubbleEl}
+      data-side={placement?.side ?? 'bottom'}
+      style="--tail:{placement?.tail ?? 0}px; {placement
+        ? `left:${placement.left}px; top:${placement.top}px;`
+        : 'left:-9999px; top:0;'}"
+    >
+      <span class="text">{t(stepsFor(activeSeries)[stepIndex].key)}</span>
+      <span class="tail" aria-hidden="true"></span>
+    </div>
+  </div>
+{/if}
+
+<style>
+  .coach {
+    position: fixed;
+    inset: 0;
+    /* Above the lobby/game and modals (Modal.svelte z 40), below toasts (z 50) so an error toast
+       still shows over it; the DebugPanel (z 10000) stays on top. */
+    z-index: 46;
+    /* Light dimming — the bubble (brand colour) carries the contrast. Tuned via screenshots. */
+    background: rgba(0, 0, 0, 0.32);
+    /* The whole layer captures taps: a tap anywhere advances, the UI underneath stays inert. */
+    touch-action: manipulation;
+  }
+  .bubble {
+    position: fixed;
+    box-sizing: border-box;
+    max-width: min(72vw, 320px);
+    padding: 9px 12px;
+    border-radius: 12px;
+    background: var(--accent);
+    color: var(--accent-text);
+    /* Reference: the in-game "N в мешке" counter (0.85rem). */
+    font-size: 0.85rem;
+    line-height: 1.3;
+    overflow-wrap: break-word;
+    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
+    opacity: 0;
+    transition: opacity 130ms ease-out;
+  }
+  .bubble.shown {
+    opacity: 1;
+  }
+  /* Larger and a touch wider in landscape, where there is room and the portrait size looks tiny. */
+  @media (orientation: landscape) {
+    .bubble {
+      max-width: min(46vw, 440px);
+      font-size: 1.05rem;
+      padding: 11px 15px;
+    }
+  }
+  @media (prefers-reduced-motion: reduce) {
+    .bubble {
+      transition: none;
+    }
+  }
+  /* The tail: an 18px-wide triangle centred on --tail along the bubble edge that faces the target.
+     `data-side` is where the bubble sits relative to the target, so the tail is on the opposite
+     edge, pointing back at it. */
+  .tail {
+    position: absolute;
+    width: 0;
+    height: 0;
+  }
+  .bubble[data-side='bottom'] .tail {
+    top: -9px;
+    left: var(--tail);
+    transform: translateX(-9px);
+    border-left: 9px solid transparent;
+    border-right: 9px solid transparent;
+    border-bottom: 9px solid var(--accent);
+  }
+  .bubble[data-side='top'] .tail {
+    bottom: -9px;
+    left: var(--tail);
+    transform: translateX(-9px);
+    border-left: 9px solid transparent;
+    border-right: 9px solid transparent;
+    border-top: 9px solid var(--accent);
+  }
+  .bubble[data-side='right'] .tail {
+    left: -9px;
+    top: var(--tail);
+    transform: translateY(-9px);
+    border-top: 9px solid transparent;
+    border-bottom: 9px solid transparent;
+    border-right: 9px solid var(--accent);
+  }
+  .bubble[data-side='left'] .tail {
+    right: -9px;
+    top: var(--tail);
+    transform: translateY(-9px);
+    border-top: 9px solid transparent;
+    border-bottom: 9px solid transparent;
+    border-left: 9px solid var(--accent);
+  }
+</style>

ui/src/components/DebugPanel.svelte

@@ -4,7 +4,7 @@
   // 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 { app, closeDebug, resetOnboarding } from '../lib/app.svelte';
   import { connection } from '../lib/connection.svelte';
   import { shareText } from '../lib/share';
   import { telegramChromeDiag } from '../lib/telegram';
@@ -26,12 +26,25 @@
       setTimeout(() => (label = 'Share'), 1500);
     }
   }
+
+  // Clear the first-run coachmark "seen" flags so the onboarding replays on the next launch — a
+  // manual re-test aid. Stops the click from also closing the panel, like the Share control.
+  let resetLabel = $state('Reset visited');
+  function resetVisited(e: MouseEvent): void {
+    e.stopPropagation();
+    resetOnboarding();
+    resetLabel = 'Cleared — relaunch';
+    setTimeout(() => (resetLabel = 'Reset visited'), 1800);
+  }
 </script>
 
 <!-- svelte-ignore a11y_click_events_have_key_events -->
 <!-- svelte-ignore a11y_no_static_element_interactions -->
 <div class="overlay" onclick={closeDebug}>
+  <div class="actions">
     <button class="share" onclick={share}>{label}</button>
+    <button class="reset" onclick={resetVisited}>{resetLabel}</button>
+  </div>
   <pre class="body">{report}</pre>
 </div>
 
@@ -49,6 +62,12 @@
     gap: 10px;
     align-items: flex-start;
   }
+  .actions {
+    flex: 0 0 auto;
+    display: flex;
+    gap: 10px;
+    flex-wrap: wrap;
+  }
   .share {
     flex: 0 0 auto;
     padding: 7px 16px;
@@ -58,6 +77,16 @@
     border-radius: var(--radius-sm);
     font-size: 0.95rem;
   }
+  /* Secondary (outline) styling so it reads as a utility next to the primary Share action. */
+  .reset {
+    flex: 0 0 auto;
+    padding: 7px 16px;
+    border: 1px solid var(--accent);
+    background: transparent;
+    color: var(--accent);
+    border-radius: var(--radius-sm);
+    font-size: 0.95rem;
+  }
   .body {
     margin: 0;
     width: 100%;

ui/src/components/Header.svelte

@@ -48,8 +48,11 @@
   </div>
   <!-- The ad banner lives inside the nav, directly under the title bar, so it sits in the
        same place on every screen — and in the game (grown nav) the spare height falls below
-       it (banner under the title, board pinned to the bottom). -->
-  {#if app.profile?.banner && app.profile.banner.campaigns.length}
+       it (banner under the title, board pinned to the bottom). It is hidden while a first-run
+       coachmark overlay is up (app.coachActive) so the scrolling strip does not run behind the
+       dimmed onboarding layer; the engine keeps rotating (module scope) and the strip reappears,
+       per this same condition, once onboarding closes. -->
+  {#if app.profile?.banner && app.profile.banner.campaigns.length && !app.coachActive}
     <AdBanner
       campaigns={app.profile.banner.campaigns}
       timings={app.profile.banner.timings}

ui/src/game/Game.svelte

@@ -1111,7 +1111,7 @@
     {@const badge = badgeKind(app.chatUnread[id] ?? false, app.messageUnread[id] ?? false)}
     <!-- svelte-ignore a11y_no_static_element_interactions -->
     <!-- svelte-ignore a11y_click_events_have_key_events -->
-    <div class="scoreboard" class:flat={landscape} onclick={landscape ? undefined : toggleHistory}>
+    <div class="scoreboard" class:flat={landscape} data-coach="game-header" onclick={landscape ? undefined : toggleHistory}>
       {#if badge}<span class="unread-dot sbadge-dot" class:nudge={badge === 'nudge'}></span>{/if}
       {#each view.game.seats as s (s.seat)}
         <div class="seat" class:turn={view.game.toMove === s.seat && !gameOver} class:win={s.isWinner}>
@@ -1250,7 +1250,7 @@
 {#snippet rackRow()}
   <!-- The footer is drawn even when the game is over (rack + controls), but inert:
        a finished game shows the final rack greyed out and the controls disabled. -->
-  <div class="rack-row" class:inert={gameOver}>
+  <div class="rack-row" class:inert={gameOver} data-coach="game-rack">
     <div class="rack-wrap">
       <Rack
         slots={rackSlots}
@@ -1271,7 +1271,7 @@
 
 {#snippet controlButtons()}
   <button class="tab" disabled={busy || !isMyTurn || !connection.online} onclick={openExchange}>
-    <span class="sq">🔄</span><span class="lbl">{t('game.draw')}</span>
+    <span class="sq" data-coach="game-turn">🔄</span><span class="lbl">{t('game.draw')}</span>
   </button>
   <TapConfirm
     triggerClass="tab"
@@ -1279,7 +1279,7 @@
     disabled={busy || !isMyTurn || !connection.online || hintCount <= 0}
     onconfirm={doHint}
   >
-    <span class="sq">🛟{#if hintCount > 0}<span class="badge">{hintCount}</span>{/if}</span>
+    <span class="sq" data-coach="game-hints">🛟{#if hintCount > 0}<span class="badge">{hintCount}</span>{/if}</span>
     <span class="lbl">{t('game.hint')}</span>
   </TapConfirm>
   {#if placement.pending.length > 0}
@@ -1288,7 +1288,7 @@
     </button>
   {:else}
     <button class="tab" disabled={busy || gameOver} onclick={shuffle}>
-      <span class="sq">🔀</span>
+      <span class="sq" data-coach="game-shuffle">🔀</span>
     </button>
   {/if}
 {/snippet}

ui/src/lib/app.svelte.ts

@@ -35,7 +35,18 @@ import {
 import { onVKPath, insideVK, vkInit, vkLaunchParams, vkUserName, vkStartParam, vkOnScheme, vkOnInsets } from './vk';
 import { CLOUD_PREFS_KEY, decodeClientPrefs, encodeClientPrefs } from './cloudprefs';
 import { parseStartParam } from './deeplink';
-import { clearSession, loadPrefs, loadSession, saveSession, savePrefs } from './session';
+import {
+  clearOnboarding,
+  clearSession,
+  loadOnboarding,
+  loadPrefs,
+  loadSession,
+  type OnboardingState,
+  saveOnboarding,
+  saveSession,
+  savePrefs,
+} from './session';
+import type { CoachSeries } from './coachmark';
 import { connection, reportOffline, reportOnline, resetConnection } from './connection.svelte';
 import { isConnectionCode } from './retry';
 import { clearGameCache, getCachedGame, setCachedGame } from './gamecache';
@@ -86,6 +97,12 @@ export const app = $state<{
   locale: Locale;
   reduceMotion: boolean;
   boardLabels: BoardLabelMode;
+  /** Completion flags for the two first-run coachmark series (components/Coachmark.svelte). */
+  onboarding: OnboardingState;
+  /** Whether a first-run coachmark overlay is currently on screen. While set, the scrolling promo
+   *  banner (components/PromoBanner) hides so it does not run above the dimmed onboarding layer,
+   *  and reappears (per its own show logic) once onboarding closes. */
+  coachActive: boolean;
   /** Pending incoming friend requests, for the lobby ⚙️ badge and the Settings Friends tab. */
   notifications: number;
   /** Per-game flag: the player has at least one unread chat entry (message or nudge) in that
@@ -128,6 +145,8 @@ export const app = $state<{
   locale: 'en',
   reduceMotion: false,
   boardLabels: 'beginner',
+  onboarding: { lobbyDone: false, gameDone: false },
+  coachActive: false,
   notifications: 0,
   chatUnread: {},
   messageUnread: {},
@@ -609,6 +628,7 @@ export async function bootstrap(): Promise<void> {
   app.theme = prefs.theme ?? 'auto';
   app.reduceMotion = prefs.reduceMotion ?? false;
   app.boardLabels = prefs.boardLabels ?? 'beginner';
+  app.onboarding = await loadOnboarding();
   applyTheme(app.theme);
   applyReduceMotion(app.reduceMotion);
   if (prefs.locale) {
@@ -904,6 +924,26 @@ export async function logout(): Promise<void> {
   navigate('/login');
 }
 
+/**
+ * markOnboardingDone records that a first-run coachmark series has been completed (its last hint
+ * was shown) and persists the flag, so the series never replays for this client. A series
+ * interrupted before its last hint is left unmarked and replays from the start next launch.
+ */
+export function markOnboardingDone(series: CoachSeries): void {
+  if (series === 'lobby') app.onboarding.lobbyDone = true;
+  else app.onboarding.gameDone = true;
+  void saveOnboarding({ ...app.onboarding });
+}
+
+/**
+ * resetOnboarding clears both coachmark completion flags (the hidden DebugPanel control), so the
+ * onboarding replays on the next launch — a manual re-test aid.
+ */
+export function resetOnboarding(): void {
+  app.onboarding = { lobbyDone: false, gameDone: false };
+  void clearOnboarding();
+}
+
 function persistPrefs(): void {
   void savePrefs({
     theme: app.theme,

ui/src/lib/coachmark.test.ts

@@ -0,0 +1,90 @@
+import { describe, expect, it } from 'vitest';
+import {
+  GAME_STEPS,
+  LOBBY_STEPS,
+  nextVisibleStep,
+  placeBubble,
+  stepsFor,
+  type Rect,
+  type Viewport,
+} from './coachmark';
+
+describe('stepsFor', () => {
+  it('returns the owner-defined order for each series', () => {
+    expect(stepsFor('lobby')).toBe(LOBBY_STEPS);
+    expect(stepsFor('game')).toBe(GAME_STEPS);
+    expect(LOBBY_STEPS.map((s) => s.target)).toEqual(['lobby-settings', 'lobby-stats', 'lobby-new']);
+    expect(GAME_STEPS.map((s) => s.target)).toEqual(['game-header', 'game-turn', 'game-hints', 'game-shuffle', 'game-rack']);
+  });
+});
+
+describe('nextVisibleStep', () => {
+  const present = () => true;
+  it('returns the start index when its target is present', () => {
+    expect(nextVisibleStep(LOBBY_STEPS, 0, present)).toBe(0);
+    expect(nextVisibleStep(LOBBY_STEPS, 1, present)).toBe(1);
+  });
+
+  it('skips steps whose target is absent', () => {
+    const isPresent = (t: string) => t !== 'game-hints' && t !== 'game-shuffle';
+    // From the hints step (index 2), both hints and shuffle are absent, so it lands on the rack.
+    expect(nextVisibleStep(GAME_STEPS, 2, isPresent)).toBe(4);
+  });
+
+  it('returns -1 when no further step is visible', () => {
+    expect(nextVisibleStep(GAME_STEPS, 5, present)).toBe(-1);
+    expect(nextVisibleStep(GAME_STEPS, 0, () => false)).toBe(-1);
+  });
+});
+
+describe('placeBubble', () => {
+  const portrait: Viewport = { width: 390, height: 844 };
+  const bubble = { width: 280, height: 80 };
+
+  it('places the bubble below a target at the top (scoreboard strip)', () => {
+    const target: Rect = { left: 0, top: 50, width: 390, height: 40 };
+    const p = placeBubble(target, portrait, bubble);
+    expect(p.side).toBe('bottom');
+    expect(p.top).toBe(100); // 50 + 40 + gap(10)
+    expect(p.left).toBe(55); // centred under the target, room to spare
+    expect(p.tail).toBeGreaterThan(8);
+  });
+
+  it('places the bubble above a bottom tab-bar target and clamps it on screen', () => {
+    const target: Rect = { left: 260, top: 790, width: 120, height: 54 };
+    const p = placeBubble(target, portrait, bubble);
+    expect(p.side).toBe('top');
+    expect(p.top).toBe(700); // 790 - gap(10) - height(80)
+    // Centring would overflow the right edge, so the bubble is clamped...
+    expect(p.left).toBe(portrait.width - bubble.width - 8);
+    // ...yet the tail still aims at the target centre.
+    const tailViewportX = p.left + p.tail;
+    expect(Math.abs(tailViewportX - (target.left + target.width / 2))).toBeLessThan(1);
+  });
+
+  it('places the bubble to the side of a tall left-panel target (landscape)', () => {
+    const landscape: Viewport = { width: 1100, height: 640 };
+    const wide = { width: 300, height: 120 };
+    const target: Rect = { left: 30, top: 20, width: 60, height: 600 };
+    const p = placeBubble(target, landscape, wide);
+    expect(p.side).toBe('right');
+    expect(p.left).toBe(100); // 30 + 60 + gap(10)
+  });
+
+  it('clamps the bubble and the tail at a corner target', () => {
+    const target: Rect = { left: 0, top: 0, width: 30, height: 30 };
+    const p = placeBubble(target, portrait, { width: 200, height: 60 });
+    expect(p.side).toBe('bottom');
+    expect(p.left).toBe(8); // left margin
+    expect(p.tail).toBe(8); // tail clamped to its minimum off the corner
+  });
+
+  it('falls back to a side and keeps the bubble within the viewport when nothing fits', () => {
+    const target: Rect = { left: 0, top: 0, width: 390, height: 844 };
+    const p = placeBubble(target, portrait, { width: 200, height: 80 });
+    expect(p.left).toBeGreaterThanOrEqual(8);
+    expect(p.left).toBeLessThanOrEqual(portrait.width - 200 - 8);
+    expect(p.top).toBeGreaterThanOrEqual(8);
+    expect(p.top).toBeLessThanOrEqual(portrait.height - 80 - 8);
+  });
+});

ui/src/lib/coachmark.ts

@@ -0,0 +1,149 @@
+// Pure logic for the first-run onboarding coachmarks (components/Coachmark.svelte). Kept free of
+// Svelte and the DOM so it is unit-testable in the node test env: the component supplies the live
+// target rectangles and renders the bubble from the geometry computed here.
+
+import type { MessageKey } from './i18n/en';
+
+/** The two independent onboarding series: the lobby (just registered) and the first game board. */
+export type CoachSeries = 'lobby' | 'game';
+
+/**
+ * A single coachmark step: the `data-coach` attribute of the element the bubble points at and the
+ * i18n key of the hint text. Steps whose target is absent at show time are skipped.
+ */
+export interface CoachStep {
+  target: string;
+  key: MessageKey;
+}
+
+/** The lobby series, in the owner-defined order: settings → stats → new game. */
+export const LOBBY_STEPS: readonly CoachStep[] = [
+  { target: 'lobby-settings', key: 'onboarding.lobbySettings' },
+  { target: 'lobby-stats', key: 'onboarding.lobbyStats' },
+  { target: 'lobby-new', key: 'onboarding.lobbyNew' },
+];
+
+/** The game series, in the owner-defined order: header → pass/exchange → hints → shuffle → rack. */
+export const GAME_STEPS: readonly CoachStep[] = [
+  { target: 'game-header', key: 'onboarding.gameHeader' },
+  { target: 'game-turn', key: 'onboarding.gameTurn' },
+  { target: 'game-hints', key: 'onboarding.gameHints' },
+  { target: 'game-shuffle', key: 'onboarding.gameShuffle' },
+  { target: 'game-rack', key: 'onboarding.gameRack' },
+];
+
+/** Returns the ordered step list for the given series. */
+export function stepsFor(series: CoachSeries): readonly CoachStep[] {
+  return series === 'lobby' ? LOBBY_STEPS : GAME_STEPS;
+}
+
+/**
+ * Returns the index of the first step at or after `from` whose target is present, or -1 when no
+ * further step is visible. The component advances through the steps with this, skipping any whose
+ * element is not on screen (e.g. a control hidden in the current game state).
+ */
+export function nextVisibleStep(steps: readonly CoachStep[], from: number, isPresent: (target: string) => boolean): number {
+  for (let i = Math.max(0, from); i < steps.length; i++) {
+    if (isPresent(steps[i].target)) return i;
+  }
+  return -1;
+}
+
+/** A minimal rectangle (a subset of DOMRect) — the target's position in the viewport. */
+export interface Rect {
+  left: number;
+  top: number;
+  width: number;
+  height: number;
+}
+
+/** The viewport size the bubble must stay inside. */
+export interface Viewport {
+  width: number;
+  height: number;
+}
+
+/** The measured bubble box, used to keep it on screen and to aim the tail. */
+export interface BubbleSize {
+  width: number;
+  height: number;
+}
+
+/** Which side of the target the bubble sits on; the tail is drawn on the bubble edge facing it. */
+export type BubbleSide = 'top' | 'bottom' | 'left' | 'right';
+
+/**
+ * The computed bubble placement. `left`/`top` are the bubble's viewport position; `tail` is the
+ * offset of the tail along the facing edge — an X from the bubble's left for top/bottom sides, a Y
+ * from the bubble's top for left/right sides — so the tail keeps pointing at the target centre even
+ * when the bubble is clamped to the viewport edge.
+ */
+export interface Placement {
+  side: BubbleSide;
+  left: number;
+  top: number;
+  tail: number;
+}
+
+/** Tuning knobs for {@link placeBubble}; all in CSS pixels. */
+export interface PlaceOpts {
+  /** Gap between the target and the bubble. */
+  gap?: number;
+  /** Minimum distance the bubble keeps from every viewport edge. */
+  margin?: number;
+  /** Half-width of the tail triangle (it cannot sit closer than this to a bubble corner). */
+  tail?: number;
+}
+
+function clamp(v: number, lo: number, hi: number): number {
+  // When the bubble is larger than the slot (lo > hi) keep the low edge so it stays anchored.
+  return hi < lo ? lo : Math.max(lo, Math.min(hi, v));
+}
+
+/**
+ * Computes where to draw the bubble for a target. It prefers the vertical axis (below a target,
+ * else above), then the horizontal axis (right, else left) — picking the first side that fits the
+ * bubble with the gap and edge margin, and otherwise the side with the most room. The bubble is
+ * clamped inside the viewport and the tail is aimed at the target centre (clamped to the bubble
+ * edge), so a target near a corner still gets a correctly pointing tail.
+ */
+export function placeBubble(target: Rect, vp: Viewport, bubble: BubbleSize, opts?: PlaceOpts): Placement {
+  const gap = opts?.gap ?? 10;
+  const margin = opts?.margin ?? 8;
+  const tail = opts?.tail ?? 8;
+
+  const tcx = target.left + target.width / 2;
+  const tcy = target.top + target.height / 2;
+
+  const space: Record<BubbleSide, number> = {
+    top: target.top,
+    bottom: vp.height - (target.top + target.height),
+    left: target.left,
+    right: vp.width - (target.left + target.width),
+  };
+
+  const fits = (side: BubbleSide): boolean => {
+    if (side === 'top' || side === 'bottom') return space[side] >= bubble.height + gap + margin;
+    return space[side] >= bubble.width + gap + margin;
+  };
+
+  // Bubble below a top target, above a bottom one, then to the side — the layout our targets use.
+  const order: BubbleSide[] = ['bottom', 'top', 'right', 'left'];
+  let side = order.find(fits);
+  if (!side) {
+    side = (Object.keys(space) as BubbleSide[]).reduce((a, b) => (space[a] >= space[b] ? a : b));
+  }
+
+  if (side === 'top' || side === 'bottom') {
+    const left = clamp(tcx - bubble.width / 2, margin, vp.width - bubble.width - margin);
+    const rawTop = side === 'top' ? target.top - gap - bubble.height : target.top + target.height + gap;
+    const top = clamp(rawTop, margin, vp.height - bubble.height - margin);
+    const tailX = clamp(tcx - left, tail, bubble.width - tail);
+    return { side, left, top, tail: tailX };
+  }
+  const top = clamp(tcy - bubble.height / 2, margin, vp.height - bubble.height - margin);
+  const rawLeft = side === 'left' ? target.left - gap - bubble.width : target.left + target.width + gap;
+  const left = clamp(rawLeft, margin, vp.width - bubble.width - margin);
+  const tailY = clamp(tcy - top, tail, bubble.height - tail);
+  return { side, left, top, tail: tailY };
+}

ui/src/lib/i18n/en.ts

@@ -65,6 +65,17 @@ export const en = {
   'new.searchHint':
     'Finding an opponent can sometimes take a while. If you do not want to wait, close the app after starting the game and come back in a couple of minutes.',
 
+  // First-run coachmark hints (components/Coachmark.svelte). The leading emoji in each comment
+  // names the UI element the bubble's tail points at.
+  'onboarding.lobbySettings': 'Friends, game & profile settings, feedback', // ⚙️
+  'onboarding.lobbyStats': 'Stats refresh after each game with an opponent', // ✏️
+  'onboarding.lobbyNew': 'Practise against the AI', // 🎲
+  'onboarding.gameHeader': 'Move history, chat and word check', // scoreboard strip
+  'onboarding.gameTurn': 'Pass a turn, swap tiles', // 🔄
+  'onboarding.gameHints': 'Available hints', // 🛟
+  'onboarding.gameShuffle': 'Shuffle your tiles', // 🔀
+  'onboarding.gameRack': 'Pick a tile and place it on the board', // rack
+
   'game.bag': '{n} in the bag',
   'game.bagEmpty': 'Bag is empty',
   'game.hints': 'Hints {n}',

ui/src/lib/i18n/ru.ts

@@ -66,6 +66,16 @@ export const ru: Record<MessageKey, string> = {
   'new.searchHint':
     'Иногда поиск соперника может занять некоторое время. Если не захотите ждать после начала игры, можете вернуться в приложение через несколько минут.',
 
+  // Подсказки первого запуска (components/Coachmark.svelte).
+  'onboarding.lobbySettings': 'Друзья, настройки игры и профиля, обратная связь', // ⚙️
+  'onboarding.lobbyStats': 'Статистика обновляется после каждой игры с соперником', // ✏️
+  'onboarding.lobbyNew': 'Потренируйтесь с ИИ', // 🎲
+  'onboarding.gameHeader': 'История ходов, чат и проверка слова', // шапка над доской
+  'onboarding.gameTurn': 'Пропуск хода, обмен фишек', // 🔄
+  'onboarding.gameHints': 'Доступные подсказки', // 🛟
+  'onboarding.gameShuffle': 'Встряхните фишки', // 🔀
+  'onboarding.gameRack': 'Выбирайте фишку и ставьте на доску', // rack
+
   'game.bag': '{n} в мешке',
   'game.bagEmpty': 'Мешок пуст',
   'game.hints': 'Подсказки {n}',

ui/src/lib/session.ts

@@ -133,3 +133,30 @@ export async function loadPrefs(): Promise<Partial<Prefs>> {
 export function savePrefs(p: Prefs): Promise<void> {
   return kvSet(PREFS_KEY, p);
 }
+
+const ONBOARDING_KEY = 'onboarding';
+
+/**
+ * Whether each first-run coachmark series has been completed. A series is marked done only after
+ * its last hint, so a player interrupted mid-series sees it again from the start next launch.
+ */
+export interface OnboardingState {
+  lobbyDone: boolean;
+  gameDone: boolean;
+}
+
+/** Loads the persisted onboarding completion flags, defaulting to not-yet-seen. */
+export async function loadOnboarding(): Promise<OnboardingState> {
+  const s = await kvGet<Partial<OnboardingState>>(ONBOARDING_KEY);
+  return { lobbyDone: s?.lobbyDone ?? false, gameDone: s?.gameDone ?? false };
+}
+
+/** Persists the onboarding completion flags. */
+export function saveOnboarding(s: OnboardingState): Promise<void> {
+  return kvSet(ONBOARDING_KEY, s);
+}
+
+/** Clears the onboarding flags so the coachmarks replay on the next launch (DebugPanel reset). */
+export function clearOnboarding(): Promise<void> {
+  return kvDel(ONBOARDING_KEY);
+}

ui/src/screens/Lobby.svelte

@@ -332,13 +332,13 @@
   {#snippet tabbar()}
     <TabBar>
       <button class="tab" disabled={atGameLimit} onclick={() => navigate('/new')}>
-        <span class="sq">🎲</span><span class="lbl">{t('lobby.new')}</span>
+        <span class="sq" data-coach="lobby-new">🎲</span><span class="lbl">{t('lobby.new')}</span>
       </button>
       <button class="tab" onclick={() => navigate('/stats')}>
-        <span class="sq">✏️</span><span class="lbl">{t('lobby.stats')}</span>
+        <span class="sq" data-coach="lobby-stats">✏️</span><span class="lbl">{t('lobby.stats')}</span>
       </button>
       <button class="tab" onclick={() => navigate('/settings')}>
-        <span class="sq">⚙️{#if settingsBadge > 0}<span class="badge">{settingsBadge}</span>{/if}</span>
+        <span class="sq" data-coach="lobby-settings">⚙️{#if settingsBadge > 0}<span class="badge">{settingsBadge}</span>{/if}</span>
         <span class="lbl">{t('lobby.settings')}</span>
       </button>
     </TabBar>