♻️ refactor: Update component imports and improve code consistency

- Refactored sidebar component to include additional sheet elements and improved accessibility with SheetHeader, SheetTitle, and SheetDescription.
- Updated skeleton component for better readability and consistency in class names.
- Refined slider component by standardizing import statements and enhancing class name formatting.
- Enhanced sonner component with consistent import statements and improved class name formatting.
- Standardized switch component imports and class names for better readability.
- Improved table component structure and class name consistency across various elements.
- Refactored tabs component for better readability and consistent class name formatting.
- Updated textarea component for improved readability and consistency in class names.
- Fixed timeline component to safely access getBoundingClientRect.
- Refactored toggle group and toggle components for improved readability and consistency in class names.
- Updated tooltip component for better readability and consistent class name formatting.
- Enhanced enhanced-input component to support generic types for better type safety.
- Refactored use-mobile hook for improved readability and consistency.
- Updated countries utility to make certain properties optional for better flexibility.
- Refined tailwind configuration for improved readability and consistency in theme settings.

apps/admin/app/dashboard/user/user-subscription/subscription-form.tsx

@@ -205,7 +205,7 @@ export function SubscriptionForm({ trigger, title, loading, initialData, onSubmi
                     <FormControl>
                       <DatePicker
                         placeholder={t('permanent')}
-                        value={field.value}
+                        value={field.value ?? undefined}
                         onChange={(value) => {
                           if (value === field.value) {
                             form.setValue(field.name, 0);