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.

frontend/tsconfig.json

@@ -1,7 +1,17 @@
 {
   "files": [],
   "references": [
-    { "path": "./tsconfig.app.json" },
-    { "path": "./tsconfig.node.json" }
-  ]
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.node.json"
+    }
+  ],
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  }
 }