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/playwright.config.ts

@@ -0,0 +1,22 @@
+import { defineConfig, devices } from '@playwright/test';
+
+// Hermetic e2e: Playwright boots the Vite dev server in `mock` mode (the in-memory
+// fake transport), so the smoke needs no backend/gateway/Postgres.
+export default defineConfig({
+  testDir: './e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 1 : 0,
+  reporter: 'list',
+  use: {
+    baseURL: 'http://localhost:4173',
+    trace: 'on-first-retry',
+  },
+  webServer: {
+    command: 'pnpm exec vite --mode mock --port 4173 --strictPort',
+    url: 'http://localhost:4173',
+    reuseExistingServer: !process.env.CI,
+    timeout: 60_000,
+  },
+  projects: [{ name: 'chromium', use: { ...devices['Desktop Chrome'] } }],
+});