build(test): run unit tests with vitest and jsdom

Karma needed headless Chrome. Vitest with jsdom runs with no browser.
Lighthouse CI now gets Chrome from @puppeteer/browsers.
Two CSS font tests are dropped: jsdom does not apply real CSS.

.gitea/workflows/build-Frontend-a.yml

@@ -26,6 +26,7 @@ jobs:
           check-latest: true
           cache: 'npm'
 
+      # Shared libraries for the Chrome that Lighthouse CI runs
       - name: Install Linux Libs
         run: |
           sudo apt-get update
@@ -57,21 +58,19 @@ jobs:
       - name: i18n Key Check
         run: npm run i18n:check
 
-      # 3. Unit Tests (Logic) — browser/launcher configured in karma.conf.js
+      # 3. Unit Tests (Vitest + jsdom, no browser)
       - name: Unit Tests
-        run: npx ng test --watch=false
+        run: npm test
 
       # 4. Build Production (necessary for lighthouse)
       - name: Build Production
         run: npx ng build --configuration production
 
       # 5. Lighthouse Audit (Performance & SEO)
-      # Puppeteer is a devDependency, so `npm ci` already installed it and
-      # downloaded Chrome. executablePath() is async in Puppeteer v25, so await it.
       - name: Lighthouse CI
         run: |
-          CHROME_PATH=$(node -e 'require("puppeteer").executablePath().then(p => console.log(p))')
-          export CHROME_PATH=$CHROME_PATH
+          CHROME_PATH=$(npx @puppeteer/browsers install chrome@stable --path "$RUNNER_TEMP/chrome" --format '{{path}}')
+          export CHROME_PATH
           npx lhci autorun
 
   # ------------------------------------------------------------------