Refactor ProxyWarden routing and settings flow

package.json

@@ -8,6 +8,7 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "preview": "vite preview",
+    "test": "vitest",
     "tauri": "tauri"
   },
   "dependencies": {
@@ -24,6 +25,7 @@
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^5.0.0",
     "typescript": "^5.8.0",
+    "vitest": "^3.2.4",
     "vite": "^7.0.0"
   }
 }