Convert from Karma/Chai/Mocha to Vitest with Playwright

- Removed karma, chai, mocha, chromium dependencies
- Installed vitest@^3.2.4, @vitest/browser, and playwright
- Created vitest.config.js with browser mode using chromium headless
- Updated test file to use vitest imports and assertions
- Renamed test.js to test.spec.js for vitest discovery
- Removed karma.config.js and pretest build script
- Updated package.json test script to use vitest
- Updated .eslintrc.json to remove mocha environment and globals
- Updated GitHub workflows to use Node 24 by default with Node 22 matrix
- Added playwright install chromium step to CI workflows

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

Author: Copilot

.eslintrc.json

@@ -20,15 +20,10 @@
         "github/unescaped-html-literal": "off",
         "import/no-unresolved": "off",
         "import/extensions": "off",
+        "import/named": "off",
         "eslint-comments/no-use": "off",
-        "github/no-inner-html": "off"
-      },
-      "env": {
-        "mocha": true
-      },
-      "globals": {
-        "assert": true,
-        "remoteForm": true
+        "github/no-inner-html": "off",
+        "i18n-text/no-en": "off"
       }
     }
   ]

.github/workflows/nodejs.yml

@@ -7,14 +7,18 @@ permissions:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22, 24]
     steps:
       - uses: actions/checkout@v4
-      - name: Use Node.js
+      - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: ${{ matrix.node-version }}
           cache: 'npm'
       - run: npm install
+      - run: npx playwright install chromium
       - run: npm run build --if-present
       - run: npm test
         env:

.github/workflows/publish.yml

@@ -15,10 +15,11 @@ 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: npm ci
+      - run: npx playwright install chromium
       - run: npm test
       - run: npm version ${TAG_NAME} --git-tag-version=false
         env: