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/ReportRoomModal.tsx

@@ -67,16 +67,19 @@ export function ReportRoomModal({ roomId, onClose }: ReportRoomModalProps) {
     submitReport(fullReason);
   };
 
-  const errcode =
+  const reportError =
     reportState.status === AsyncStatus.Error
-      ? (reportState.error as { errcode?: string })?.errcode
+      ? (reportState.error as { errcode?: string; httpStatus?: number })
       : undefined;
+  const errcode = reportError?.errcode;
   const errorMsg =
     errcode === 'M_LIMIT_EXCEEDED'
       ? 'You are being rate limited. Please wait before reporting again.'
       : errcode === 'M_FORBIDDEN'
         ? 'You cannot report this room.'
-        : 'Failed to submit report. Please try again.';
+        : errcode === 'M_UNRECOGNIZED' || reportError?.httpStatus === 404
+          ? 'Room reporting is not supported by your homeserver.'
+          : 'Failed to submit report. Please try again.';
 
   return (
     <Overlay open backdrop={<OverlayBackdrop />}>

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"

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

@@ -15,7 +15,7 @@ import {
   Text,
   config,
 } from 'folds';
-import { MatrixEvent, Method, Room } from 'matrix-js-sdk';
+import { MatrixEvent, Room } from 'matrix-js-sdk';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
 import { stopPropagation } from '../../../utils/keyboard';
 import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
@@ -77,10 +77,13 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
     useCallback(async () => {
       if (!eventId) return { events: [], hasMore: false };
 
-      const path = `/rooms/${encodeURIComponent(roomId)}/relations/${encodeURIComponent(eventId)}/m.replace`;
-      const res = await mx.http.authedRequest<EditHistoryResponse>(Method.Get, path, {
-        limit: '50',
-      });
+      // Relations API lives at /_matrix/client/v1/ (not v3); use raw fetch to avoid SDK prefix
+      const token = mx.getAccessToken();
+      const baseUrl = mx.getHomeserverUrl();
+      const url = `${baseUrl}/_matrix/client/v1/rooms/${encodeURIComponent(roomId)}/relations/${encodeURIComponent(eventId)}/m.replace?limit=50`;
+      const fetchRes = await fetch(url, { headers: { Authorization: `Bearer ${token}` } });
+      if (!fetchRes.ok) throw new Error(`HTTP ${fetchRes.status}`);
+      const res = (await fetchRes.json()) as EditHistoryResponse;
       const rawEvents = res.chunk ?? [];
       const events = rawEvents
         .filter(isRawEditEvent)