android accounts: force chats/realtime resync on account switch

android/CHANGELOG.md

@@ -780,3 +780,9 @@
   - introduced dedicated `startup` route with session-check loader,
   - delayed auth/chats navigation until session check is finished.
 - Added safe fallback in `MainActivity` theme bootstrap to prevent crash if `ThemeRepository` injection is unexpectedly unavailable during startup.
+
+### Step 114 - Multi-account switch sync fix (chats + realtime)
+- Fixed account switch flow to fully rebind app data context:
+  - restart realtime socket on new active account token,
+  - force refresh chats for both `archived=false` and `archived=true` right after switch.
+- Fixed navigation behavior on account switch to avoid noisy `popBackStack ... not found` and stale restored stack state.

android/app/src/main/java/ru/daemonlord/messenger/ui/account/AccountViewModel.kt

@@ -12,9 +12,11 @@ import kotlinx.coroutines.launch
 import ru.daemonlord.messenger.core.token.TokenRepository
 import ru.daemonlord.messenger.domain.auth.usecase.LoginUseCase
 import ru.daemonlord.messenger.domain.account.repository.AccountRepository
+import ru.daemonlord.messenger.domain.chat.repository.ChatRepository
 import ru.daemonlord.messenger.domain.common.AppError
 import ru.daemonlord.messenger.domain.common.AppResult
 import ru.daemonlord.messenger.domain.notifications.repository.NotificationSettingsRepository
+import ru.daemonlord.messenger.domain.realtime.RealtimeManager
 import ru.daemonlord.messenger.domain.settings.model.AppThemeMode
 import ru.daemonlord.messenger.domain.settings.repository.ThemeRepository
 import javax.inject.Inject
@@ -24,6 +26,8 @@ class AccountViewModel @Inject constructor(
     private val accountRepository: AccountRepository,
     private val tokenRepository: TokenRepository,
     private val loginUseCase: LoginUseCase,
+    private val chatRepository: ChatRepository,
+    private val realtimeManager: RealtimeManager,
     private val notificationSettingsRepository: NotificationSettingsRepository,
     private val themeRepository: ThemeRepository,
 ) : ViewModel() {
@@ -145,7 +149,20 @@ class AccountViewModel @Inject constructor(
                 onSwitched(false)
                 return@launch
             }
+            // Force data/context switch to the newly active account.
+            realtimeManager.disconnect()
+            realtimeManager.connect()
+            val allResult = chatRepository.refreshChats(archived = false)
+            val archivedResult = chatRepository.refreshChats(archived = true)
             refresh()
+            val syncFailed = allResult is AppResult.Error && archivedResult is AppResult.Error
+            if (syncFailed) {
+                _uiState.update {
+                    it.copy(
+                        errorMessage = "Account switched, but chats sync failed. Pull to refresh.",
+                    )
+                }
+            }
             onSwitched(true)
         }
     }

android/app/src/main/java/ru/daemonlord/messenger/ui/navigation/AppNavGraph.kt

@@ -252,8 +252,11 @@ fun MessengerNavHost(
                     onSwitchAccount = {
                         viewModel.recheckSession()
                         navController.navigate(Routes.Chats) {
-                            popUpTo(Routes.Chats) { inclusive = true }
+                            popUpTo(navController.graph.findStartDestination().id) {
+                                saveState = false
+                            }
                             launchSingleTop = true
+                            restoreState = false
                         }
                     },
                     onLogout = viewModel::logout,