feat: add Radix UI components and global styles

- Introduced new UI components: Input, Separator, Sheet, Sidebar, Skeleton, and Tooltip.
- Added global CSS styles for sidebar theming.
- Updated package.json and pnpm-lock.yaml to include Radix UI dependencies.

package.json

@@ -10,7 +10,10 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-separator": "^1.1.7",
     "@radix-ui/react-slot": "^1.2.3",
+    "@radix-ui/react-tooltip": "^1.2.8",
     "@tailwindcss/vite": "^4.1.16",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",