refactor(longpoll): route parsed long poll events through dedicated handler and persist message/conversation state updates

feature/convos/src/main/kotlin/dev/meloda/fast/convos/ConvosViewModel.kt

@@ -613,6 +613,7 @@ class ConvosViewModel(
         if (convoIndex == null) { // диалога нет в списке
             // pizdets
         } else {
+            // TODO: 30.05.2026, Danil Nikolaev: reimplement
             newConvos.removeAt(convoIndex)
 
             replaceConvos(newConvos.sorted())

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryViewModelImpl.kt

@@ -1037,6 +1037,7 @@ class MessagesHistoryViewModelImpl(
             isSpam = false,
             pinnedAt = null,
             formatData = formatData,
+            isDeleted = false
         )
         formatData = formatData.copy(items = emptyList())
         sendingMessages += newMessage