Preserve Android feedback state and supplementary Unicode characters

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

@@ -1249,6 +1249,7 @@ class ChatViewModel : ViewModel() {
         r.sendMessage(ch.id, text)
         viewModelScope.launch {
             _messages.value = withContext(Dispatchers.IO) { r.getMessages(ch.id) }
+                .map { it.copy(feedback = feedbackCache[it.messageId]) }
             refreshChannels()
         }
     }