feat: Implement settings dropdown and page components

- Added `SettingsDropdown` component for selecting settings sections with icons and descriptions.
- Created `SettingsPage` component to manage user settings, including account details, notifications, calendar availability, privacy, and appearance.
- Introduced `SettingsSwitcher` for selecting options within settings.
- Integrated command and dialog components for improved user interaction.
- Updated `UserDropdown` to include links for settings and logout.
- Refactored button styles and card footer layout for consistency.
- Added popover functionality for dropdown menus.
- Updated dependencies in `yarn.lock` for new components.

src/components/ui/card.tsx

@@ -126,7 +126,7 @@ function CardFooter({ className, ...props }: React.ComponentProps<'div'>) {
   return (
     <div
       data-slot='card-footer'
-      className={cn('flex items-center px-6 [.border-t]:pt-6', className)}
+      className={cn('flex items-center px-6', className)}
       {...props}
     />
   );