fix: CI Prettier, P1-6 poll button, P1-11 stale knock state

- LOTUS_TODO.md: Prettier formatting (CI gate fix)
- P1-6: Wire PollCreator into RoomInput — poll button (Icons.OrderList)
  opens modal, renders PollCreator when pollOpen is true
- P1-11: Reset knocked + knockError on room.roomId change via useEffect;
  add missing useEffect import to RoomIntro.tsx

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

src/app/features/room/RoomInput.tsx

@@ -121,6 +121,7 @@ import { useRoomCreatorsTag } from '../../hooks/useRoomCreatorsTag';
 import { usePowerLevelTags } from '../../hooks/usePowerLevelTags';
 import { useComposingCheck } from '../../hooks/useComposingCheck';
 import { VoiceMessageRecorder } from '../../components/VoiceMessageRecorder';
+import { PollCreator } from './PollCreator';
 
 const GifPicker = React.lazy(() =>
   import('../../components/GifPicker').then((m) => ({ default: m.GifPicker })),
@@ -154,6 +155,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
     useEffect(() => {
       setCharCount(0);
     }, [roomId]);
+    const [pollOpen, setPollOpen] = useState(false);
 
     const alive = useAlive();
     const [msgDraft, setMsgDraft] = useAtom(roomIdToMsgDraftAtomFamily(roomId));
@@ -952,6 +954,16 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
                   <Icon src={Icons.SpaceGlobe} size="100" />
                 )}
               </IconButton>
+              <IconButton
+                onClick={() => setPollOpen(true)}
+                aria-label="Create poll"
+                variant="SurfaceVariant"
+                size="300"
+                radii="300"
+                title="Create poll"
+              >
+                <Icon src={Icons.OrderList} size="100" />
+              </IconButton>
               <VoiceMessageRecorder
                 onSend={handleVoiceSend}
                 onError={(err) => {
@@ -995,6 +1007,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
             )
           }
         />
+        {pollOpen && <PollCreator room={room} roomId={roomId} onClose={() => setPollOpen(false)} />}
       </div>
     );
   },