chore(frontend): remove unused zustand dependency and fix HTML title

- Remove zustand from package.json (was declared but never imported)
- Fix index.html title from 'arma3-frontend' to 'Arma 3 Server Manager'

frontend/package.json

@@ -7,6 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "oxlint",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -18,16 +20,19 @@
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
     "react-router-dom": "^7.18.1",
-    "tailwindcss": "^4.3.2",
-    "zustand": "^5.0.14"
+    "tailwindcss": "^4.3.2"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^7.0.0",
+    "@testing-library/react": "^16.3.2",
     "@types/node": "^24.13.2",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.3",
+    "jsdom": "^29.1.1",
     "oxlint": "^1.71.0",
     "typescript": "~6.0.2",
-    "vite": "^8.1.1"
+    "vite": "^8.1.1",
+    "vitest": "^4.1.10"
   }
 }