feat: Improve screen transition animations and simplify account handling in MainActivity

app/src/main/java/com/rosetta/messenger/MainActivity.kt

@@ -170,15 +170,13 @@ class MainActivity : ComponentActivity() {
                         targetState = when {
                             showSplash -> "splash"
                             showOnboarding && hasExistingAccount == false -> "onboarding"
-                            // 🔥 КРИТИЧНО: если currentAccount != null - сразу на main без ожидания isLoggedIn
-                            currentAccount != null -> "main"
                             isLoggedIn != true && hasExistingAccount == false -> "auth_new"
                             isLoggedIn != true && hasExistingAccount == true -> "auth_unlock"
                             else -> "main"
                         },
                         transitionSpec = {
-                            fadeIn(animationSpec = tween(300)) togetherWith
-                                    fadeOut(animationSpec = tween(200))
+                            fadeIn(animationSpec = tween(600)) togetherWith
+                                    fadeOut(animationSpec = tween(600))
                         },
                         label = "screenTransition"
                     ) { screen ->
@@ -212,13 +210,7 @@ class MainActivity : ComponentActivity() {
                                         currentAccount = account
                                         hasExistingAccount = true
                                         // Save as last logged account
-                                        account?.let { 
-                                            accountManager.setLastLoggedPublicKey(it.publicKey)
-                                            // 🔥 КРИТИЧНО: Сразу устанавливаем флаг логина чтобы не было Loading экрана
-                                            scope.launch {
-                                                accountManager.setCurrentAccount(it.publicKey)
-                                            }
-                                        }
+                                        account?.let { accountManager.setLastLoggedPublicKey(it.publicKey) }
                                         
                                         // 📤 Отправляем FCM токен на сервер после успешной аутентификации
                                         account?.let { sendFcmTokenToServer(it) }
@@ -362,22 +354,13 @@ fun MainScreen(
     onToggleTheme: () -> Unit = {},
     onLogout: () -> Unit = {}
 ) {
-    // 🔥 Используем моковый аккаунт если account == null (для предотвращения крашей)
-    val effectiveAccount = account ?: DecryptedAccount(
-        publicKey = "loading",
-        privateKey = "loading",
-        seedPhrase = emptyList(),
-        privateKeyHash = "loading",
-        name = "Loading..."
-    )
-    
-    val accountName = effectiveAccount.name
-    val accountPhone = effectiveAccount.publicKey.take(16).let { 
+    val accountName = account?.name ?: "Account"
+    val accountPhone = account?.publicKey?.take(16)?.let { 
         "+${it.take(1)} ${it.substring(1, 4)} ${it.substring(4, 7)}${it.substring(7)}" 
-    }
-    val accountPublicKey = effectiveAccount.publicKey
-    val accountPrivateKey = effectiveAccount.privateKey
-    val privateKeyHash = effectiveAccount.privateKeyHash
+    } ?: "+7 775 9932587"
+    val accountPublicKey = account?.publicKey ?: "04c266b98ae5"
+    val accountPrivateKey = account?.privateKey ?: ""
+    val privateKeyHash = account?.privateKeyHash ?: ""
     
     // Состояние протокола для передачи в SearchScreen
     val protocolState by ProtocolManager.state.collectAsState()