fix: P0 post-deploy bug fixes from live testing

- EditHistoryModal: use raw fetch with /_matrix/client/v1/ path for
  relations API — Synapse only supports relations at v1, not v3 (fixes
  Sentry JAVASCRIPT-REACT-K / 404 error)
- RoomViewHeader: remove useReportRoomSupported spec-version gate —
  Synapse 1.114+ has the endpoint but only advertises spec v1.12;
  button now always shows for non-creator, non-server-notice rooms
- ReportRoomModal: handle M_UNRECOGNIZED/404 with "not supported by
  your homeserver" message
- RoomNavItem: add isServerNotice guard to Room Settings in sidebar
  context menu (was only guarded in header three-dots menu)
- initMatrix: bump setMaxListeners from 50 → 150 to prevent
  MaxListenersExceededWarning with large room lists
- RoomProfile: save topic with formatted_body + format when markdown
  syntax is detected; add markdown hint below topic textarea

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

src/app/features/room/RoomViewHeader.tsx

@@ -49,7 +49,6 @@ import { roomToUnreadAtom } from '../../state/room/roomToUnread';
 import { copyToClipboard } from '../../utils/dom';
 import { LeaveRoomPrompt } from '../../components/leave-room-prompt';
 import { useRoomAvatar, useLocalRoomName, useRoomTopic } from '../../hooks/useRoomMeta';
-import { useReportRoomSupported } from '../../hooks/useReportRoomSupported';
 import { ScreenSize, useScreenSizeContext } from '../../hooks/useScreenSize';
 import { stopPropagation } from '../../utils/keyboard';
 import { getMatrixToRoom } from '../../plugins/matrix-to';
@@ -90,7 +89,6 @@ const RoomMenu = forwardRef<HTMLDivElement, RoomMenuProps>(({ room, requestClose
 
   const permissions = useRoomPermissions(creators, powerLevels);
   const canInvite = permissions.action('invite', mx.getSafeUserId());
-  const reportRoomSupported = useReportRoomSupported();
   const isServerNotice = room.getType() === 'm.server_notice';
   const isCreator = creators.has(mx.getSafeUserId());
   const notificationPreferences = useRoomsNotificationPreferencesContext();
@@ -247,7 +245,7 @@ const RoomMenu = forwardRef<HTMLDivElement, RoomMenuProps>(({ room, requestClose
       </Box>
       <Line variant="Surface" size="300" />
       <Box direction="Column" gap="100" style={{ padding: config.space.S100 }}>
-        {reportRoomSupported && !isServerNotice && !isCreator && (
+        {!isServerNotice && !isCreator && (
           <MenuItem
             onClick={() => setReportRoomOpen(true)}
             variant="Critical"