feat: add global styles and transitions for dark mode support

- Created style.css for base styles and color variables for light and dark themes.
- Added tailwind.css for Tailwind CSS integration and custom theme variables.
- Introduced transitions.css to manage global transitions and reduce motion preferences.
- Updated tsconfig.app.json to include path aliases for easier imports.
- Modified tsconfig.json to set baseUrl and paths for module resolution.
- Added typed-router.d.ts for auto-generated route types.
- Enhanced vite.config.ts with Vue Router plugin, Tailwind CSS integration, and server proxy settings.

backend/src/config/database.ts

@@ -1,9 +1,10 @@
 export default {
-  uri: process.env.MONGODB_URI || 'mongodb://localhost:27017',
-  dbName: process.env.MONGODB_DB_NAME || 'budget-manager',
+  uri: process.env.MONGODB_URI || "mongodb://localhost:27017",
+  dbName: process.env.MONGODB_DB_NAME || "budget-manager",
   collections: {
-    users: 'users',
-    transactions: 'transactions',
-    categories: 'categories'
-  }
+    users: "users",
+    transactions: "transactions",
+    categories: "categories",
+    pushSubscriptions: "push_subscriptions",
+  },
 };