feat: add macOS compatibility with optional Playwright

.github/workflows/ci.yml

@@ -1,6 +1,7 @@
+---
 name: CI
 
-on:
+"on":
   push:
     branches: [main]
   pull_request:
@@ -28,3 +29,22 @@ jobs:
       - run: npm run setup
       - run: npm run typecheck
       - run: npm run test:managed
+
+  macos:
+    strategy:
+      matrix:
+        os: [macos-15, macos-15-intel]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22.19.0
+          cache: npm
+          cache-dependency-path: |
+            pi/package-lock.json
+            pi-web/package-lock.json
+      - run: npm run setup
+      - run: npm run typecheck
+      - run: npm run test:managed