Harden panic recovery and service shutdown

bitchat/Features/voice/VoiceCaptureSession.swift

@@ -26,6 +26,8 @@ protocol VoiceCaptureSession: AnyObject {
     /// nothing valid was captured.
     func finish() async -> URL?
     func cancel() async
+    /// Stops capture and suppresses every later send before returning.
+    func panicCancelSynchronously()
 }
 
 /// The classic record-then-send backend, wrapping the shared `VoiceRecorder`.
@@ -55,6 +57,10 @@ final class VoiceNoteCaptureSession: VoiceCaptureSession {
     func cancel() async {
         await recorder.cancelRecording(owner: owner)
     }
+
+    func panicCancelSynchronously() {
+        recorder.panicCancelSynchronously(owner: owner)
+    }
 }
 
 /// Testable surface of the live capture engine. Production uses
@@ -216,6 +222,13 @@ final class PTTLiveVoiceSession: VoiceCaptureSession {
         }
     }
 
+    func panicCancelSynchronously() {
+        // Do not emit a canceled packet: it would itself be pre-panic
+        // conversation data racing the emergency transport reset.
+        completed = true
+        capture.cancel()
+    }
+
     private func sendControlPacket(_ kind: VoiceBurstPacket.Kind) {
         guard let packet = VoiceBurstPacket(burstID: burstID, seq: stream.packetizer.nextSeq, kind: kind) else { return }
         sendPacket(packet.encode())

bitchat/Features/voice/VoiceRecorder.swift

@@ -246,6 +246,21 @@ actor VoiceRecorder {
         currentURL = nil
     }
 
+    /// Panic is a synchronous security boundary: the caller must know the
+    /// microphone, audio-session lease, and partial file are gone before it
+    /// rotates identities or deletes the media tree. VoiceRecorder is an
+    /// independent actor and this cleanup path never hops to MainActor, so a
+    /// short semaphore join is safe even when invoked by the UI actor.
+    nonisolated
+    func panicCancelSynchronously(owner: RecordingOwner) {
+        let finished = DispatchSemaphore(value: 0)
+        Task {
+            await cancelRecording(owner: owner)
+            finished.signal()
+        }
+        finished.wait()
+    }
+
     /// The audio session was interrupted (call, Siri) or reconfigured: stop
     /// the recorder but keep `recorder`/`currentURL` so the caller's pending
     /// `stopRecording()` still returns the partial note.