style: increase spacing between wallet header icon buttons

Changed gap-2 to gap-3 for better visual separation between the info,
refresh, and disconnect icon buttons in the wallet viewer header.

src/components/WalletViewer.tsx

@@ -993,7 +993,7 @@ export default function WalletViewer() {
         </div>
 
         {/* Right: Info Dropdown, Refresh, Disconnect */}
-        <div className="flex items-center gap-2">
+        <div className="flex items-center gap-3">
           {walletInfo && (
             <DropdownMenu>
               <DropdownMenuTrigger asChild>