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>

.gitea/workflows/ui-test.yaml

@@ -0,0 +1,119 @@
+name: ui-test
+
+# Tier 1 (per-PR) workflow. Runs Vitest + Playwright for the UI client and
+# the monorepo Go service tests (everything except the integration suite,
+# which lives behind `make -C integration integration` and needs a Docker
+# daemon set up for testcontainers).
+#
+# The path filter is intentionally broad until a dedicated go-test
+# workflow is introduced; this is the only CI gate today.
+
+on:
+  push:
+    paths:
+      - 'ui/**'
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/ui-test.yaml'
+  pull_request:
+    paths:
+      - 'ui/**'
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/ui-test.yaml'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.work
+          cache: true
+
+      - name: Run Go tests
+        # client/ is the deprecated Fyne client; excluded from CI per
+        # ui/PLAN.md §74. -count=1 disables Go's test cache so a green
+        # run never depends on a previous runner's cached state. The
+        # backend suite is run with -p 1 because most backend packages
+        # spawn their own Postgres testcontainer, and parallel
+        # Postgres bootstraps starve each other on a constrained
+        # runner. pkg modules are listed one by one because ./pkg/...
+        # does not recurse across the independent go.work modules
+        # under pkg/.
+        run: |
+          go test -count=1 -p 1 ./backend/...
+          go test -count=1 \
+            ./gateway/... \
+            ./game/... \
+            ./pkg/calc/... \
+            ./pkg/connector/... \
+            ./pkg/cronutil/... \
+            ./pkg/error/... \
+            ./pkg/geoip/... \
+            ./pkg/model/... \
+            ./pkg/postgres/... \
+            ./pkg/redisconn/... \
+            ./pkg/schema/... \
+            ./pkg/storage/... \
+            ./pkg/transcoder/... \
+            ./pkg/util/...
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 11.0.7
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: ui/pnpm-lock.yaml
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: pnpm install --frozen-lockfile
+
+      - name: Install Playwright browsers
+        working-directory: ui/frontend
+        run: pnpm exec playwright install --with-deps
+
+      - name: Run Vitest
+        working-directory: ui/frontend
+        run: pnpm test
+
+      - name: Run Playwright
+        working-directory: ui/frontend
+        run: pnpm exec playwright test
+
+      - name: Upload Playwright report on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: ui/frontend/playwright-report/
+          retention-days: 14
+
+      - name: Upload Playwright traces on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-traces
+          path: ui/frontend/test-results/
+          retention-days: 14