style: update Dialog component close button styles

- Modified the close button in the Dialog component to include a focus background color for improved accessibility and visual feedback.
- Adjusted the size class for the close button icon to ensure consistent styling.

Signed-off-by: Innei <tukon479@gmail.com>

Author: Innei

src/components/ui/dialog/Dialog.tsx

@@ -162,7 +162,7 @@ function DialogContent({
               {...props}
             >
               {children}
-              <DialogPrimitive.Close className="absolute right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground">
+              <DialogPrimitive.Close className="absolute right-4 top-4 focus:bg-fill size-6 rounded-sm opacity-70 transition-opacity hover:opacity-100 focus:outline-none disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground">
                 <i className="size-4 i-mingcute-close-line" />
                 <span className="sr-only">Close</span>
               </DialogPrimitive.Close>