test(frontend): Vitest-Unit-Tests + CI-Integration, CLAUDE.md ignoriert

16 Tests ohne Browser-Abhängigkeit (jsdom): useIsDesktop (matchMedia-Reaktion),
client.ts (ApiError, Popup-Blocker-Fix bei ladeDokumentAnsehen), CommandPalette
(Debounce/Escape/Material-Treffer-Hinweis), ObjektListPage (Standort-
Gruppierung, Kacheln-Umschalter, localStorage-Persistenz, Suche). Vitest
separat von vite.config.ts (eigene vitest.config.ts), e2e/*.spec.ts (Playwright)
explizit ausgeschlossen. CI führt `npm run test` jetzt vor dem Build aus.

Nebenbei: CLAUDE.md ins .gitignore aufgenommen (bleibt lokal, nicht Teil des
Repos).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CVgbozhYmuEhiEJHffRXCV

frontend/package.json

@@ -7,6 +7,8 @@
     "dev": "vite",
     "build": "tsc --noEmit && vite build",
     "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "test:e2e": "playwright test",
     "test:e2e:ui": "playwright test --ui"
   },
@@ -26,12 +28,17 @@
   "devDependencies": {
     "@playwright/test": "^1.47.2",
     "@tailwindcss/vite": "^4.3.3",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.3",
+    "@testing-library/user-event": "^14.6.7",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
+    "jsdom": "^25.0.1",
     "tailwindcss": "^4.3.3",
     "typescript": "^5.5.4",
     "vite": "^5.4.6",
-    "vite-plugin-pwa": "^0.20.5"
+    "vite-plugin-pwa": "^0.20.5",
+    "vitest": "^2.1.9"
   }
 }