[Working Draft] Introduce Playwright test framework

.github/workflows/playwright.yml

@@ -0,0 +1,30 @@
+name: Playwright Tests
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+jobs:
+  test:
+    timeout-minutes: 60
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: lts/*
+    - name: Install dependencies
+      run: npm ci
+    - name: Install Playwright Browsers
+      run: npx playwright install --with-deps chromium
+    - name: Run Playwright tests
+      # Only test on Chromium
+      # Each version of playwright is tied to the latest version of Chromium (at the time). The version is listed here:
+      # https://github.com/microsoft/playwright?tab=readme-ov-file#documentation--api-reference
+      run: npx playwright test --project=chromium
+    - uses: actions/upload-artifact@v4
+      if: always()
+      with:
+        name: playwright-report
+        path: playwright-report/
+        retention-days: 30

.gitignore

@@ -1,3 +1,13 @@
 .DS_Store
 node_modules/
-_site/
+_site/
+
+## Playwright-specific ignores
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/
+
+## IDE and runtime ignores
+/.idea
+bun.lockb