feat: add UI components and improve layout

- Introduced new UI components: Input, Label, ScrollArea, Separator, Sheet, Skeleton, Table.
- Implemented utility function for class name merging.
- Enhanced the authenticated layout with a sidebar and user menu.
- Added login functionality with improved UI and error handling.
- Integrated theme provider for consistent theming across the application.
- Updated styles with Tailwind CSS and custom properties for dark mode support.
- Refactored routes to utilize new components and improve user experience.

components.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "new-york",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "",
+    "css": "src/styles.css",
+    "baseColor": "neutral",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "iconLibrary": "lucide"
+}