feat: enhance UI components with new border radius and tooltip features

- Added new border radius options (2xl, 3xl) in Tailwind configuration and globals.css.
- Integrated Tooltip component in ChatShareButton and ModelSelector for improved user experience.
- Updated button styles for consistency across components, including NotificationButton and ModelSelector.
- Minor text adjustments for clarity in SourceDetailPanel.

surfsense_web/components/notifications/NotificationButton.tsx

@@ -31,7 +31,7 @@ export function NotificationButton() {
 			<Tooltip>
 				<TooltipTrigger asChild>
 					<PopoverTrigger asChild>
-						<Button variant="outline" size="icon" className="h-8 w-8 relative">
+						<Button variant="outline" size="icon" className="h-8 w-8 relative border-0">
 							<Bell className="h-4 w-4" />
 							{unreadCount > 0 && (
 								<span