phase 2: ui testing infrastructure

Vitest + @testing-library/jest-dom matchers wired through tests/setup.ts.
Playwright with four projects: chromium-desktop, webkit-desktop,
chromium-mobile-iphone-13, chromium-mobile-pixel-5; traces and
screenshots retained on failure.

.gitea/workflows/ui-test.yaml runs Tier 1 on every push and pull
request: monorepo Go service tests (backend with -p 1 to dodge
testcontainer contention; gateway, game, every pkg/<name> module),
pnpm install --frozen-lockfile, playwright install --with-deps,
pnpm test, pnpm exec playwright test. Uploads playwright-report
and test-results on failure. Integration suite stays gated behind
make -C integration integration; deprecated client/ excluded.

.gitea/workflows/ui-release.yaml mirrors Tier 1 on v* tag push and
keeps commented placeholders for visual regression (Phase 33) and
macOS iOS smoke (Phase 32).

ui/docs/testing.md documents both tiers and the local invocations
that mirror what CI runs. ui/PLAN.md Phase 2 marked done; Phase 3
gains a bullet to extend the go test command with ./ui/core/...;
Phase 36 has the renamed release workflow path.

tools/local-ci/ ships a self-contained docker-compose for verifying
workflows against a local Gitea + arm64 act_runner before pushing
to a real instance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/frontend/package.json

@@ -8,15 +8,19 @@
     "build": "vite build",
     "preview": "vite preview",
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
-    "test": "vitest run"
+    "test": "vitest run",
+    "test:e2e": "playwright test"
   },
   "devDependencies": {
+    "@playwright/test": "^1.59.1",
     "@sveltejs/adapter-static": "^3.0.0",
     "@sveltejs/kit": "^2.59.0",
     "@sveltejs/vite-plugin-svelte": "^7.0.0",
+    "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/svelte": "^5.2.0",
     "@types/node": "^22.0.0",
     "jsdom": "^25.0.0",
+    "playwright": "^1.59.1",
     "svelte": "^5.0.0",
     "svelte-check": "^4.0.0",
     "tslib": "^2.6.0",