feat: add UI components and utilities

- Introduced Skeleton component for loading states.
- Added Slider component with customizable properties.
- Implemented Sonner for toast notifications with icons.
- Created Spinner component for loading indicators.
- Developed Switch component for toggle functionality.
- Added Table component with subcomponents for structured data display.
- Implemented Tabs component for tabbed navigation.
- Created Textarea component for multi-line text input.
- Developed ToggleGroup and Toggle components for grouped toggle functionality.
- Added Tooltip component for contextual hints.
- Implemented useIsMobile hook for responsive design.
- Updated global styles with Tailwind CSS and custom properties.
- Added utility functions for class name management.
- Configured TypeScript paths for easier imports.
- Updated Vite configuration to include Tailwind CSS and path aliases.

libertas-frontend/src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}