- 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
