Keep failed settings teardown retryable and preserve UI until database stop succeeds

tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt

@@ -67,8 +67,8 @@ object NativeLib {
     }
 
     fun restart(dbPath: String, controlPort: Int, configText: String): Boolean {
-        prepareForCoreStop()
-        return nativeRestart(configText).also { coreStopping = false }
+        try { prepareForCoreStop(); return nativeRestart(configText) }
+        finally { coreStopping = false }
     }
 
     /** Снять frontend-владельцев перед stop/restart/сменой ключей. Неподтверждённый CallService либо ещё
@@ -95,7 +95,7 @@ object NativeLib {
         return nativeUpdateSockets(configText)
     }
 
-    fun isReady(): Boolean = !coreStopping && nativeIsRunning()
+    fun isReady(): Boolean = nativeIsRunning()
 
     fun getMyNodeId(): Long = nativeGetMyNodeId()
 
@@ -154,8 +154,8 @@ object NativeLib {
     fun setUdpLogTarget(ip: String, port: Int) { nativeSetUdpLogTarget(ip, port) }
     /** Принимает полный INI для пересоздания ядра с новой сохранённой идентичностью; true подтверждает приём запроса. */
     fun regenerateKeys(configText: String): Boolean {
-        prepareForCoreStop()
-        return nativeRegenerateKeys(configText).also { coreStopping = false }
+        try { prepareForCoreStop(); return nativeRegenerateKeys(configText) }
+        finally { coreStopping = false }
     }
 
     /* ── Channel members ── */
@@ -315,8 +315,14 @@ object NativeLib {
 
     /* ── P2P аудио-звонок (сигналинг) ── */
     /** true — копия команды принята живым worker; результат согласования приходит CALL_* событием. */
-    fun callStart(channelId: String, peerNodeId: Long, callId: Long): Boolean = nativeCallStart(channelId, peerNodeId, callId)
-    fun callAccept(callId: Long): Boolean = nativeCallAccept(callId)
+    fun callStart(channelId: String, peerNodeId: Long, callId: Long): Boolean {
+        if (coreStopping) { LogManager.addLog("WARN", "Call", "Start rejected during core teardown id=$callId"); return false }
+        return nativeCallStart(channelId, peerNodeId, callId)
+    }
+    fun callAccept(callId: Long): Boolean {
+        if (coreStopping) { LogManager.addLog("WARN", "Call", "Accept rejected during core teardown id=$callId"); return false }
+        return nativeCallAccept(callId)
+    }
     fun callDecline(callId: Long): Boolean = nativeCallDecline(callId)
     fun callHangup(callId: Long): Boolean = nativeCallHangup(callId)
     fun callContinue(callId: Long): Boolean = nativeCallContinue(callId)

tools/chatgui-android/app/src/main/java/com/utun/chat/viewmodel/ChatViewModel.kt

@@ -1866,10 +1866,10 @@ class ChatViewModel : ViewModel() {
         viewModelScope.launch {
             try {
                 HeadlessService.awaitStartup()
-                clearState()
                 withContext(Dispatchers.IO) {
                     val wasRunning = NativeLib.isReady()
                     NativeLib.stop()
+                    withContext(Dispatchers.Main) { clearState() }
                     val cleared = NativeLib.clearDatabase()
                     if (!cleared) LogManager.addLog("ERROR", "CFG", "database reset rejected by native backend")
                     if (wasRunning) {