Convert from Karma/Mocha/Chai to Vitest with Playwright

Co-authored-by: dgreif <3026298+dgreif@users.noreply.github.com>

Author: Copilot

.github/workflows/nodejs.yml

@@ -16,10 +16,12 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version-file: '.node-version'
+          node-version: 24
           cache: 'npm'
       - run: npm install
+      - run: npx playwright install chromium --only-shell
       - run: npm run build
+      - run: npm run lint
       - run: npm test
         env:
           CI: true

.github/workflows/publish.yml

@@ -14,10 +14,11 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version-file: '.node-version'
+          node-version: 24
           registry-url: https://registry.npmjs.org/
           cache: npm
       - run: npm ci
+      - run: npx playwright install chromium --only-shell
       - run: npm test
       - run: npm version ${TAG_NAME} --git-tag-version=false
         env:

.gitignore

@@ -1,2 +1,3 @@
 dist/
 node_modules/
+test/__screenshots__/

.node-version

@@ -1 +1 @@
-22
+24