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/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)