refine: improve provider card UI with compact action buttons and simplified link styling

- Convert edit and usage buttons to icon-only ghost variant for cleaner appearance
- Reduce action button padding (px-2) and group spacing (gap-0) for more compact layout
- Add red hover effect to delete icon for better visual feedback
- Vertically center action buttons with provider info on desktop view
- Simplify provider URL link by removing icon and using soft blue color (blue-400/300)
- Reduce enable button width from 96px to 80px for better proportions

src/components/providers/ProviderCard.tsx

@@ -96,7 +96,7 @@ export function ProviderCard({
           "cursor-grabbing border-primary/60 shadow-lg",
       )}
     >
-      <div className="flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
+      <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
         <div className="flex flex-1 items-start gap-3">
           <button
             type="button"
@@ -127,10 +127,9 @@ export function ProviderCard({
               <button
                 type="button"
                 onClick={handleOpenWebsite}
-                className="inline-flex items-center gap-1 text-sm text-primary transition-colors hover:underline"
+                className="inline-flex items-center text-sm text-blue-400 transition-colors hover:underline dark:text-blue-300"
                 title={displayUrl}
               >
-                <Link className="h-3.5 w-3.5" />
                 <span className="truncate">{displayUrl}</span>
               </button>
             )}