Migrate from Karma/Mocha/Chai to Vitest with Playwright

Co-authored-by: dgreif <[email protected]>

Author: Copilot

.github/workflows/nodejs.yml

@@ -7,12 +7,17 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22, 24]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: ${{ matrix.node-version }}
           cache: npm
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
       - name: npm install, build, and test
         run: |
           npm install

.github/workflows/publish-pages.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 24
           cache: npm
 
       - run: npm install

.github/workflows/publish.yml

@@ -15,9 +15,10 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 24
           registry-url: https://registry.npmjs.org/
           cache: npm
+      - run: npx playwright install --with-deps chromium
       - run: npm ci
       - run: npm test
       - run: npm version ${TAG_NAME} --git-tag-version=false