fix: poll multiple-choice toggle + Sentry JAVASCRIPT-REACT-N

PollCreator: replace maxSelections/options.length stale-closure pattern
with isMultiple: boolean state. max_selections computed from filledOptions
at submit time. Radio inputs replaced with styled toggle buttons that
visually highlight the active selection.

PollContent: catch getPendingEvents error (Sentry JAVASCRIPT-REACT-N).
SDK throws Cannot call getPendingEvents with pendingEventOrdering ==
chronological when sending poll vote events with m.reference relation.
Silently catch so optimistic UI update stands — vote will retry on next
sync if needed.

Fixes JAVASCRIPT-REACT-N

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/message/content/PollContent.tsx

@@ -203,12 +203,12 @@ export function PollContent({
       mx.sendEvent(roomId, 'm.poll.response' as any, {
         'm.relates_to': { rel_type: 'm.reference', event_id: eventId },
         'm.selections': [answerId],
-      });
+      }).catch(() => undefined);
     } else {
       mx.sendEvent(roomId, 'org.matrix.msc3381.poll.response' as any, {
         'm.relates_to': { rel_type: 'm.reference', event_id: eventId },
         'org.matrix.msc3381.poll.response': { answers: [answerId] },
-      });
+      }).catch(() => undefined);
     }
   };