ci: add Playwright E2E tests to CI pipeline

Runs as a separate job after unit tests pass, using the official
Playwright Docker image with Chromium pre-installed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -26,3 +26,32 @@ jobs:
 
       - name: Build
         run: bun run build
+
+  e2e:
+    needs: ci
+    runs-on: docker
+    container:
+      image: mcr.microsoft.com/playwright:v1.59.1-noble
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Bun
+        run: |
+          curl -fsSL https://bun.sh/install | bash
+          echo "$HOME/.bun/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: |
+          export PATH="$HOME/.bun/bin:$PATH"
+          bun install --frozen-lockfile --ignore-scripts
+
+      - name: Build client
+        run: |
+          export PATH="$HOME/.bun/bin:$PATH"
+          bun run build
+
+      - name: Run E2E tests
+        run: |
+          export PATH="$HOME/.bun/bin:$PATH"
+          CI=true bun run test:e2e