Remove embedded music player

The music feature is retired: delete the Media tab, MediaAPI,
MediaPlayerController, PinnedMediaResourceLoader, MediaPanelView, the
media_state control publish, media scope handling in VoiceSession, the
volume setting, and all media tests. App is now Talk + Activity tabs.

Backend media API in hope-voice-api is untouched (still serves the web UI).

Sources/LiveKit/VoiceSession.swift

@@ -48,7 +48,6 @@ final class VoiceSession: ObservableObject {
     let transcriptHandler = TranscriptHandler()
     let stateModel = ConversationStateModel()
     let taskStore = TaskStore()
-    let mediaController: MediaPlayerController
     private let config: ServerConfig
     private let tokenClient: TokenClient
     private let settings: SettingsStore
@@ -90,9 +89,6 @@ final class VoiceSession: ObservableObject {
         self.config = config
         self.tokenClient = tokenClient
         self.settings = settings
-        let mediaAPI = MediaAPI(config: config)
-        self.mediaController = MediaPlayerController(api: mediaAPI, settings: settings)
-        mediaController.attach(session: self)
         room.add(delegate: self)
         room.add(delegate: controlChannel)
         room.add(delegate: transcriptHandler)
@@ -211,7 +207,6 @@ final class VoiceSession: ObservableObject {
         do {
             let token = try await tokenClient.fetchToken()
             logger.log("token ok room=\(token.room, privacy: .public)")
-            await mediaController.enterMediaScope(roomName: token.room)
             try await room.connect(url: config.livekitURL.absoluteString, token: token.token, connectOptions: makeConnectOptions())
             result = .success(())
         } catch {
@@ -263,8 +258,7 @@ final class VoiceSession: ObservableObject {
     private func handleAgentTimeout(generation: Int) async {
         guard generation == sessionGeneration, state == .waitingAgent else { return }
         guard !reconnectAttempted else {
-            // Final failure: tear down the live room, restore the idle timer,
-            // and end the media scope so no stale room or wake lock survives.
+            // Final failure: tear down the live room and restore the idle timer.
             logger.log("agent timeout final, tearing down")
             await teardownForFailure(message: "Agent never joined. Is the agent worker running?")
             return
@@ -281,8 +275,7 @@ final class VoiceSession: ObservableObject {
     /// current generation (so stale callbacks become no-ops), clear all
     /// per-room/session ephemeral published fields (agent, mute state, model
     /// list, error state, interruption ownership), disconnect and recreate the
-    /// room, stop conversation state, restore the idle timer, and end the media
-    /// scope. Only after all cleanup completes does the session publish
+    /// room, stop conversation state, restore the idle timer, and publish
     /// `.failed(message)`, making retry safe: the old room is fully torn down
     /// before Start becomes available again.
     ///
@@ -308,7 +301,6 @@ final class VoiceSession: ObservableObject {
         interruptionSequence += 1
         stateModel.stop()
         UIApplication.shared.isIdleTimerDisabled = false
-        await mediaController.endConversation()
         await teardownRoom()
 
         // Final reset immediately before publishing .failed: any old-room
@@ -540,15 +532,13 @@ final class VoiceSession: ObservableObject {
         interruptionSequence += 1
         stateModel.stop()
         UIApplication.shared.isIdleTimerDisabled = false
-        await mediaController.endConversation()
         await teardownRoom()
         // Final reset before publishing .idle: any old-room callback delivered
         // during the teardownRoom() await may have repopulated ephemeral fields.
         // This ensures the idle state is clean for server replacement (Iteration 09).
         resetEphemeralFields()
-        // Publish .idle only after media and room teardown have completed.
-        // This makes idle a truthful readiness signal for server replacement:
-        // the old session is fully torn down before the UI shows "ready to start".
+        // Publish .idle only after room teardown has completed: the old session
+        // is fully torn down before the UI shows "ready to start".
         state = .idle
     }