fix: upgrade matrix-js-sdk 38.2.0 -> 41.5.0 with API compat fixes

- sessionMembershipsForRoom() removed in v41 (was synchronous, static)
- Replacement: read session.memberships directly (always up-to-date, sync)
  - useCall.ts: useCallMembers reads session.memberships
  - useCallEmbed.ts: createCallEmbed reads rtcSession.memberships
  - CallEmbedProvider.tsx: inline check on session.memberships
- Remove unused MatrixRTCSession import from CallEmbedProvider
- clearLoginData: also unregisters service workers and clears SW caches

src/app/components/CallEmbedProvider.tsx

@@ -111,8 +111,7 @@ function IncomingCall({ dm, info, onIgnore, onAnswer, onReject }: IncomingCallPr
   useCallMembersChange(
     session,
     useCallback(() => {
-      const members = MatrixRTCSession.sessionMembershipsForRoom(room, session.sessionDescription);
-      if (members.length === 0) {
+      if (session.memberships.length === 0) {
         onIgnore();
       }
     }, [room, session, onIgnore]),