Stage 7 (wip): tests + UI CI

- Vitest units: board replay, placement machine, premium parity, i18n key parity, FlatBuffers codec round-trips (19 tests)
- Playwright smoke (mock transport): guest -> lobby -> board -> place tile -> preview
- ui-test.yaml workflow: check/unit/build + bundle-size budget (67.5KB gzip < 100KB) + chromium e2e
- gateway transcode tests for games.list (seat display_name), pass, hint
- backend integration test for game.ListForAccount

.gitea/workflows/ui-test.yaml

@@ -0,0 +1,56 @@
+name: Tests · UI
+
+# Hermetic UI checks: type-check, Vitest unit tests, production build with a
+# bundle-size budget, and a Playwright smoke against the in-memory mock transport
+# (no backend/gateway/Postgres). The committed src/gen/ codegen is built, not
+# regenerated (the same model as the Go committed jet/fbs output).
+
+on:
+  push:
+    paths:
+      - 'ui/**'
+      - '.gitea/workflows/ui-test.yaml'
+  pull_request:
+    paths:
+      - 'ui/**'
+      - '.gitea/workflows/ui-test.yaml'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+        working-directory: ui
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install pnpm
+        run: npm install -g pnpm@11.0.9
+
+      - name: Install deps
+        run: pnpm install --frozen-lockfile
+
+      - name: Type-check
+        run: pnpm run check
+
+      - name: Unit tests
+        run: pnpm run test:unit
+
+      - name: Build
+        run: pnpm run build
+
+      - name: Bundle-size budget
+        run: node scripts/bundle-size.mjs
+
+      - name: Install Playwright browser
+        run: pnpm exec playwright install --with-deps chromium
+
+      - name: E2E smoke (mock)
+        run: pnpm run test:e2e