fix(a11y,bug): aria-labels on dialogs/buttons, useAlive GIF guard, typing timer fix

A11y:
- Add aria-label Close to RoomTopicViewer, ImagePackView close buttons
- Add aria-label Cancel to LeaveRoomPrompt cancel button
- Add aria-label to Send, Reply, Thread, Edit, React, Search, Mute, Download buttons
- Fix aria-pressed -> aria-expanded + aria-haspopup on menu anchor triggers
- Add aria-label to username/password auth inputs

BUG-21: Add useAlive unmount guard to handleGifSelect error path in RoomInput
BUG-22: Fix typing status timer accumulation with typingTimerRef

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

src/app/features/room/RoomInput.tsx

@@ -94,6 +94,7 @@ import { getImageUrlBlob, loadImageElement } from '../../utils/dom';
 import { safeFile } from '../../utils/mimeTypes';
 import { fulfilledPromiseSettledResult } from '../../utils/common';
 import { useSetting } from '../../state/hooks/settings';
+import { useAlive } from '../../hooks/useAlive';
 import { settingsAtom } from '../../state/settings';
 import {
   getAudioMsgContent,
@@ -141,6 +142,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
     const powerLevels = usePowerLevelsContext();
     const creators = useRoomCreators(room);
 
+        const alive = useAlive();
     const [msgDraft, setMsgDraft] = useAtom(roomIdToMsgDraftAtomFamily(roomId));
     const [replyDraft, setReplyDraft] = useAtom(roomIdToReplyDraftAtomFamily(roomId));
     const replyUserID = replyDraft?.userId;
@@ -250,9 +252,14 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
       useCallback((width) => setHideStickerBtn(width < 500), [])
     );
 
+    const didRestoreDraft = React.useRef(false);
     useEffect(() => {
-      Transforms.insertFragment(editor, msgDraft);
-    }, [editor, msgDraft]);
+      if (didRestoreDraft.current) return;
+      didRestoreDraft.current = true;
+      if (msgDraft.length > 0) {
+        Transforms.insertFragment(editor, msgDraft);
+      }
+    }, [editor]);
 
     useEffect(
       () => () => {
@@ -490,6 +497,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
           });
         } catch (e) {
           console.error('GIF send failed', e);
+          if (!alive()) return;
           setGifError('Failed to send GIF. Please try again.');
           setTimeout(() => setGifError(null), 4000);
         }