fix: correct event type in ForwardMessageDialog and poll response format

- ForwardMessageDialog: use sendEvent instead of sendMessage to preserve
  the original event type (stickers, polls, etc.)
- PollContent: use m.selections for stable m.poll.response (per spec),
  was incorrectly using m.responses

src/app/features/room/message/ForwardMessageDialog.tsx

@@ -39,7 +39,7 @@ export function ForwardMessageDialog({ mEvent, onClose }: Props) {
   const forward = (roomId: string, roomName: string) => {
     const fwdContent: Record<string, unknown> = { ...mEvent.getContent() };
     delete fwdContent['m.relates_to'];
-    mx.sendMessage(roomId, fwdContent as any);
+    mx.sendEvent(roomId, mEvent.getType(), fwdContent as any);
     setSentTo(roomName);
     setTimeout(onClose, 1200);
   };