Stage 7 (wip): UI shell, libs, mock transport, screens (lobby->game), e2e smoke

- plain Svelte 5 + TS + Vite (no SvelteKit); CSS-token design system (Telegram-ready), hash router, IndexedDB session
- pure libs: domain model, premium/value maps ported from solver, board replay, placement state machine, i18n en/ru
- in-memory mock transport + seed data; pnpm start runs lobby->active game->board with no backend
- board: pointer-drag + tap placement, MakeMove (popup / 1s-hold commit), two-state zoom, blank chooser, exchange, hint, word-check, chat
- Playwright smoke (mock) green; svelte-check clean; mock bundle ~37 KB gzip

ui/e2e/smoke.spec.ts

@@ -0,0 +1,29 @@
+import { expect, test } from '@playwright/test';
+
+// The playable-slice smoke against the mock transport: guest login -> lobby shows the
+// seeded active game -> open it -> the board renders committed tiles -> place a rack
+// tile (tap) and see the score preview.
+test('guest reaches a board and previews a placement', async ({ page }) => {
+  await page.goto('/');
+
+  await page.getByRole('button', { name: /guest/i }).click();
+
+  await expect(page.getByText('Active games')).toBeVisible();
+  const activeRow = page.getByRole('button', { name: /Ann/ });
+  await expect(activeRow).toBeVisible();
+  await activeRow.click();
+
+  // Board renders, including a committed tile from the seeded HELLO play.
+  await expect(page.locator('[data-cell]').first()).toBeVisible();
+  await expect(page.locator('[data-cell] .letter', { hasText: 'H' }).first()).toBeVisible();
+
+  // Tap a rack tile, then an empty board cell -> a pending tile + score preview.
+  const rackTile = page.locator('.rack .tile').first();
+  await rackTile.click();
+  await page.locator('[data-cell]:not(.filled)').nth(30).click();
+  await expect(page.locator('[data-cell].pending')).toHaveCount(1);
+  await expect(page.locator('.preview')).toContainText(/\d/);
+
+  // The contextual MakeMove control appears once a tile is pending.
+  await expect(page.getByRole('button', { name: /make move/i })).toBeVisible();
+});