Add npm run commands for running tests

Run tests in github actions

.github/workflows/tests.yml

@@ -0,0 +1,23 @@
+name: Tests
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: latest
+    - name: Install dependencies
+      run: npm ci
+    - name: Install Playwright Browsers
+      run: npx playwright install --with-deps
+    - name: Run Playwright tests
+      run: npm run test
+    - uses: actions/upload-artifact@v4
+      if: always()
+      with:
+        name: playwright-report
+        path: playwright-report/
+        retention-days: 30

package.json

@@ -26,7 +26,9 @@
     "preview": "vite preview",
     "build_grammar": "lezer-generator src/editor/lang-heynote/heynote.grammar -o src/editor/lang-heynote/parser.js",
     "webapp:dev": "vite webapp",
-    "webapp:build": "vite build webapp"
+    "webapp:build": "vite build webapp",
+    "test": "playwright test",
+    "test:ui": "playwright test --ui"
   },
   "devDependencies": {
     "@codemirror/autocomplete": "^6.11.1",