pasteFromRing method
Paste a specific entry from the ring by index (0 = most recent).
Also copies it to the system clipboard.
Implementation
Future<String?> pasteFromRing(int index) async {
final entry = ring.entryAt(index);
if (entry == null) return null;
await Clipboard.setData(ClipboardData(text: entry.content));
return entry.content;
}