Fix clipboard copy with fallback for iOS/older browsers

- Add try-catch around navigator.clipboard.writeText
- Add fallback using textarea + execCommand for older browsers
- Add final fallback using prompt() to show URL if all else fails

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/settings/page.tsx

@@ -91,9 +91,28 @@ export default function SettingsPage() {
   };
 
   const copyToClipboard = async (text: string) => {
+    try {
       await navigator.clipboard.writeText(text);
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
+    } catch {
+      // Fallback for older browsers or permission denied
+      const textArea = document.createElement("textarea");
+      textArea.value = text;
+      textArea.style.position = "fixed";
+      textArea.style.left = "-9999px";
+      document.body.appendChild(textArea);
+      textArea.select();
+      try {
+        document.execCommand("copy");
+        setCopied(true);
+        setTimeout(() => setCopied(false), 2000);
+      } catch {
+        // If all else fails, show the URL in a prompt
+        window.prompt("Copy this URL:", text);
+      }
+      document.body.removeChild(textArea);
+    }
   };
 
   const handleImport = async () => {