Convert from mocha/chai to Vitest and update workflows

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

Author: Copilot

.github/workflows/nodejs.yml

@@ -8,11 +8,15 @@ permissions:
 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 }}
+      - run: npx playwright install chromium
       - name: npm install, build, and test
         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 chromium
       - run: npm ci
       - run: npm test
       - run: npm run build