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.

package.json

@@ -6,7 +6,7 @@
     "start": "ng serve",
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
-    "test": "ng test",
+    "test": "ng test --watch=false",
     "lint": "ng lint",
     "i18n:check": "node scripts/check-i18n.mjs"
   },
@@ -38,20 +38,14 @@
     "@lhci/cli": "^0.15.1",
     "@puppeteer/browsers": "3.2.4",
     "@tailwindcss/postcss": "^4.3.3",
-    "@types/jasmine": "~7.0.0",
     "@webgpu/types": "^0.1.74",
     "angular-eslint": "22.6.0",
     "eslint": "^10.12.0",
-    "jasmine-core": "^7.0.2",
-    "karma": "^6.4.4",
-    "karma-chrome-launcher": "^3.2.0",
-    "karma-coverage": "^2.2.1",
-    "karma-jasmine": "^5.1.0",
-    "karma-jasmine-html-reporter": "^2.2.0",
-    "puppeteer": "^25.13.0",
+    "jsdom": "^30.1.2",
     "tailwindcss": "^4.3.3",
     "typescript": "~6.0.3",
-    "typescript-eslint": "^8.71.1"
+    "typescript-eslint": "^8.71.1",
+    "vitest": "^5.0.4"
   },
   "overrides": {
     "tmp": "^0.2.3",