feat: add UI components for skeleton, slider, sonner, switch, table, tabs, textarea, toggle group, toggle, tooltip, and mobile detection hook

- Implemented Skeleton component for loading states.
- Created Slider component using Radix UI for customizable sliders.
- Added Sonner component for toast notifications with theme support.
- Developed Switch component for toggle functionality.
- Introduced Table component with subcomponents for structured data display.
- Built Tabs component for tabbed navigation.
- Created Textarea component for multi-line text input.
- Implemented ToggleGroup and Toggle components for grouped toggle buttons.
- Added Tooltip component for displaying additional information on hover.
- Created useIsMobile hook for mobile device detection.
- Added utility functions for class name merging.
- Configured TypeScript settings for the project.

music-metadata-manager-frontend/postcss.config.mjs

@@ -0,0 +1,5 @@
+const config = {
+  plugins: ["@tailwindcss/postcss"],
+};
+
+export default config;