feat: add UI components and utilities

- Introduced Skeleton component for loading states.
- Added Slider component with customizable properties.
- Implemented Sonner for toast notifications.
- Created Switch component for toggle functionality.
- Developed Table component with header, body, footer, and cell subcomponents.
- Added Tabs component with list, trigger, and content subcomponents.
- Implemented Tooltip component with provider, trigger, and content.
- Created useIsMobile hook for responsive design.
- Added global styles in index.css with custom properties.
- Implemented utility function for class name merging.
- Set up main entry point for the application.
- Configured TypeScript settings for the application and node.
- Set up Vite configuration with React and Tailwind CSS support.

src/App.tsx

@@ -0,0 +1,11 @@
+import { ThemeProvider } from './components/ThemeProvider'
+
+function App() {
+  return (
+    <ThemeProvider defaultTheme="dark" storageKey="vite-ui-theme">
+      <div>App</div>
+    </ThemeProvider>
+  )
+}
+
+export default App