Refactor Matrix/LiveKit session merging

- Replace MatrixLivekitItem with MatrixLivekitMember, add displayName$
  and participantId, and use explicit LiveKit participant types
- Make sessionBehaviors$ accept a props object and return a typed
  RxRtcSession
- Update CallViewModel to use the new session behaviors, rebuild media
  items from matrixLivekitMembers, handle missing connections and use
  participantId-based keys
- Change localMembership/localTransport to accept Behavior-based
  options, read options.value for enterRTCSession, and fix advertised
  transport selection order
- Update tests and minor UI adjustments (settings modal livekitRooms
  stubbed) and fix JSON formatting in locales

src/room/InCallView.tsx

@@ -138,7 +138,7 @@ export const ActiveCall: FC<ActiveCallProps> = (props) => {
       },
       reactionsReader.raisedHands$,
       reactionsReader.reactions$,
-      trackProcessorState$,
+      scope.behavior(trackProcessorState$),
     );
     setVm(vm);
 
@@ -247,7 +247,7 @@ export const InCallView: FC<InCallViewProps> = ({
     () => void toggleRaisedHand(),
   );
 
-  const allLivekitRooms = useBehavior(vm.allLivekitRooms$);
+  // const allLivekitRooms = useBehavior(vm.allLivekitRooms$);
   const audioParticipants = useBehavior(vm.audioParticipants$);
   const participantCount = useBehavior(vm.participantCount$);
   const reconnecting = useBehavior(vm.reconnecting$);
@@ -841,7 +841,8 @@ export const InCallView: FC<InCallViewProps> = ({
             onDismiss={closeSettings}
             tab={settingsTab}
             onTabChange={setSettingsTab}
-            livekitRooms={allLivekitRooms}
+            // TODO expose correct data to setttings modal
+            livekitRooms={[]}
           />
         </>
       )}