style: unify button row styling in figlet font preview

- Update Copy, Share, PNG, and TXT button icons to h-3 w-3 with mr-2
- Matches the styling of the Random font button for a consistent UI

components/figlet/FontPreview.tsx

@@ -65,23 +65,23 @@ export function FontPreview({ text, font, isLoading, onCopy, onDownload, onShare
             <div className="flex gap-2 flex-wrap">
               {onCopy && (
                 <Button variant="outline" size="sm" onClick={onCopy}>
-                  <Copy className="h-4 w-4" />
+                  <Copy className="h-3 w-3 mr-2" />
                   Copy
                 </Button>
               )}
               {onShare && (
                 <Button variant="outline" size="sm" onClick={onShare} title="Copy shareable URL">
-                  <Share2 className="h-4 w-4" />
+                  <Share2 className="h-3 w-3 mr-2" />
                   Share
                 </Button>
               )}
               <Button variant="outline" size="sm" onClick={handleExportPNG} title="Export as PNG">
-                <ImageIcon className="h-4 w-4" />
+                <ImageIcon className="h-3 w-3 mr-2" />
                 PNG
               </Button>
               {onDownload && (
                 <Button variant="outline" size="sm" onClick={onDownload}>
-                  <Download className="h-4 w-4" />
+                  <Download className="h-3 w-3 mr-2" />
                   TXT
                 </Button>
               )}