feat: authorize iOS Hermes accounts and secure session isolation

Sources/LiveKit/TranscriptHandler.swift

@@ -30,6 +30,7 @@ final class TranscriptHandler: ObservableObject {
     /// history; live events append/update here. Trimmed to 50 finals.
     @Published private(set) var events: [TranscriptEvent] = []
 
+    var acceptsRoom: ((Room) -> Bool)?
     let history: TranscriptHistory
 
     // MARK: Cross-source dedupe state
@@ -204,8 +205,9 @@ extension TranscriptHandler: RoomDelegate {
             TranscriptEvent(id: $0.id, role: resolvedRole, text: $0.text, isFinal: $0.isFinal, timestamp: $0.lastReceivedTime)
         }
         Task { @MainActor [weak self] in
+            guard let self, self.acceptsRoom?(room) ?? true else { return }
             for event in events {
-                self?.receiveSegment(id: event.id, role: event.role, text: event.text, isFinal: event.isFinal)
+                self.receiveSegment(id: event.id, role: event.role, text: event.text, isFinal: event.isFinal)
             }
         }
     }