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.

angular.json

@@ -87,27 +87,7 @@
           "builder": "@angular/build:extract-i18n"
         },
         "test": {
-          "builder": "@angular/build:karma",
-          "options": {
-            "karmaConfig": "karma.conf.js",
-            "tsConfig": "tsconfig.spec.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              {
-                "glob": "**/*",
-                "input": "public"
-              },
-              {
-                "glob": "**/*",
-                "input": "src/assets",
-                "output": "/assets"
-              }
-            ],
-            "styles": [
-              "src/tailwind.css",
-              "src/styles.scss"
-            ]
-          }
+          "builder": "@angular/build:unit-test"
         },
         "lint": {
           "builder": "@angular-eslint/builder:lint",