fix(ios audio): stop the speaker<->BT oscillation; single override, no re-force

v1.1.1's route observer re-forced speaker on every change, and WebKit re-added Bluetooth
each time -> the audio flapped speaker<->BT many times/sec (telemetry: dozens of route
flips from 3 taps), which read as 'sound doesn't switch'. WKWebView won't let the app
hold the built-in speaker over an active BT device. So: one override per tap, observer
only REPORTS the output (no fighting). Also stop dimming the iOS button (it's a live
output indicator, not on/off; the dim read as 'disabled' on BT). Probe now carries the
native marker so we can confirm the binary. plugin v1.1.2-stable, web batch150.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/plugins/audio-route/ios/Sources/AudioRoutePlugin/AudioRoutePlugin.swift

@@ -5,16 +5,14 @@ import AVFoundation
 // Call-audio routing for the iOS app. Registered by cap sync as a real Capacitor plugin package, so it shows
 // up as window.Capacitor.Plugins.AudioRoute (an app-embedded class gets stripped in release builds).
 //
-// The built-in EARPIECE is unreachable inside a WKWebView — WebKit owns the WebRTC audio unit and forces the
-// loudspeaker. So this plugin exposes only what iOS actually allows for call audio:
-//   * setSpeaker(true)  -> force the loudspeaker. IMPORTANT: overrideOutputAudioPort(.speaker) ALONE cannot
-//                          beat a connected Bluetooth headset (BT is higher priority), so we also DROP the
-//                          Bluetooth options from the category (options [.defaultToSpeaker]) so BT isn't a
-//                          candidate output — that's what actually forces the speaker over BT.
-//   * setSpeaker(false) -> "Device": allow BT/wired again and use the default port, which routes to a connected
-//                          headset (else the system default).
-// It also REPORTS the active output to the web UI (getRoute() + a 'routeChange' event), because iOS hides audio
-// outputs from JavaScript, so the web layer can't otherwise show the correct speaker/bluetooth/headset icon.
+// KNOWN CEILING (WKWebView): the app does NOT own the AVAudioSession — WebKit's media process does, and it
+// re-asserts its own category (Bluetooth allowed) on every change. So the earpiece can't be forced, and the
+// built-in speaker can't be held over an actively-connected Bluetooth device (a re-force just oscillates with
+// WebKit — proven on device). This plugin therefore does a SINGLE override per user tap and does NOT fight
+// route changes; it only reports the active output so the web UI can show the correct icon.
+//   * setSpeaker(true)  -> try to force the loudspeaker (drops Bluetooth options + overrideOutputAudioPort(.speaker))
+//   * setSpeaker(false) -> "Device": allow BT/wired and use the default port (routes to a connected headset)
+//   * getRoute() + 'routeChange' event -> the active output ('speaker'|'bluetooth'|'wired'|'receiver'|'airplay')
 @objc(AudioRoutePlugin)
 public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
     public let identifier = "AudioRoutePlugin"
@@ -24,7 +22,7 @@ public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         CAPPluginMethod(name: "getRoute", returnType: CAPPluginReturnPromise)
     ]
 
-    private var wantSpeaker = false
+    private static let nativeTag = "1.1.2-stable"
     private var pending: DispatchWorkItem?
 
     override public func load() {
@@ -35,8 +33,6 @@ public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
 
     deinit { NotificationCenter.default.removeObserver(self) }
 
-    // Force the loudspeaker even over a connected BT headset: with no .allowBluetooth option, BT is not an
-    // eligible output, so the port override lands on the built-in speaker.
     private func configureSpeaker() throws {
         let s = AVAudioSession.sharedInstance()
         try s.setCategory(.playAndRecord, mode: .voiceChat, options: [.defaultToSpeaker])
@@ -44,7 +40,6 @@ public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         try s.overrideOutputAudioPort(.speaker)
     }
 
-    // Allow BT/wired and use the default port (routes to a connected headset, else the system default).
     private func configureDevice() throws {
         let s = AVAudioSession.sharedInstance()
         try s.setCategory(.playAndRecord, mode: .voiceChat, options: [.allowBluetooth, .allowBluetoothA2DP])
@@ -52,7 +47,6 @@ public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         try s.overrideOutputAudioPort(.none)
     }
 
-    // The ACTIVE output, mapped to a simple label the web UI turns into an icon.
     private func currentOutput() -> String {
         for o in AVAudioSession.sharedInstance().currentRoute.outputs {
             switch o.portType {
@@ -67,31 +61,29 @@ public class AudioRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         return "unknown"
     }
 
+    // Report the active output to the web UI. Deliberately does NOT re-force any route — fighting WebKit's
+    // re-assertion just oscillates the audio (see ceiling note above).
     @objc private func routeChanged() {
-        // Coalesce the burst iOS fires on device (dis)connect, then re-hold the loudspeaker if the user chose
-        // it (a BT connect can steal the route), and tell the web UI where the audio actually is.
         pending?.cancel()
         let work = DispatchWorkItem { [weak self] in
             guard let self = self else { return }
-            let onSpeaker = AVAudioSession.sharedInstance().currentRoute.outputs.contains { $0.portType == .builtInSpeaker }
-            if self.wantSpeaker && !onSpeaker { try? self.configureSpeaker() }
-            self.notifyListeners("routeChange", data: ["output": self.currentOutput()])
+            self.notifyListeners("routeChange", data: ["output": self.currentOutput(), "native": AudioRoutePlugin.nativeTag])
         }
         pending = work
         DispatchQueue.main.asyncAfter(deadline: .now() + 0.2, execute: work)
     }
 
     @objc func setSpeaker(_ call: CAPPluginCall) {
-        wantSpeaker = call.getBool("on") ?? true
+        let on = call.getBool("on") ?? true
         do {
-            if wantSpeaker { try configureSpeaker() } else { try configureDevice() }
-            call.resolve(["output": currentOutput()])   // immediate (may be stale); the routeChange event corrects it
+            if on { try configureSpeaker() } else { try configureDevice() }
+            call.resolve(["output": currentOutput(), "native": AudioRoutePlugin.nativeTag])
         } catch {
             call.reject(error.localizedDescription)
         }
     }
 
     @objc func getRoute(_ call: CAPPluginCall) {
-        call.resolve(["output": currentOutput()])
+        call.resolve(["output": currentOutput(), "native": AudioRoutePlugin.nativeTag])
     }
 }