improved playright integration

.github/workflows/ci.yml

@@ -352,6 +352,54 @@ jobs:
       - name: Run DM unit tests
         run: npm run test:dm:unit
 
+  e2e-tests:
+    runs-on: ubuntu-latest
+    timeout-minutes: 35
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [22]
+        project: [e2e, e2e-firefox]
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Cache npm directory
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ matrix.node-version }}-npm-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ matrix.node-version }}-npm-
+
+      - name: Cache node_modules
+        id: node-modules-cache
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-${{ matrix.node-version }}-modules-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ matrix.node-version }}-modules-
+
+      - name: Install dependencies
+        if: steps.node-modules-cache.outputs.cache-hit != 'true'
+        run: npm ci
+
+      - name: Build app
+        run: npm run build
+
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium firefox
+
+      - name: Run deterministic E2E suite (${{ matrix.project }})
+        run: npx playwright test tests/e2e --project=${{ matrix.project }}
+
   dm-integration-tests:
     runs-on: ubuntu-latest
     timeout-minutes: 30