feat: Replace custom header with TopAppBar for improved layout and smoother transitions in ChatsListScreen

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

@@ -24,10 +24,12 @@ import androidx.compose.ui.unit.sp
 import com.rosetta.messenger.data.AccountManager
 import com.rosetta.messenger.data.DecryptedAccount
 import com.rosetta.messenger.data.PreferencesManager
+import com.rosetta.messenger.network.ProtocolManager
 import com.rosetta.messenger.ui.auth.AccountInfo
 import com.rosetta.messenger.ui.auth.AuthFlow
 import com.rosetta.messenger.ui.chats.ChatsListScreen
 import com.rosetta.messenger.ui.chats.ChatDetailScreen
+import com.rosetta.messenger.ui.chats.SearchScreen
 import com.rosetta.messenger.network.SearchUser
 import com.rosetta.messenger.ui.onboarding.OnboardingScreen
 import com.rosetta.messenger.ui.splash.SplashScreen
@@ -218,12 +220,16 @@ fun MainScreen(
     val accountPrivateKey = account?.privateKey ?: ""
     val privateKeyHash = account?.privateKeyHash ?: ""
     
+    // Состояние протокола для передачи в SearchScreen
+    val protocolState by ProtocolManager.state.collectAsState()
+    
     // Навигация между экранами
     var selectedUser by remember { mutableStateOf<SearchUser?>(null) }
+    var showSearchScreen by remember { mutableStateOf(false) }
     
-    // Анимированный переход между чатами - плавный crossfade без прыжков
+    // Анимированный переход между экранами
     AnimatedContent(
-        targetState = selectedUser,
+        targetState = Triple(selectedUser, showSearchScreen, Unit),
         transitionSpec = {
             // Плавный crossfade для избежания "прыжков" header'а
             val enterAnim = fadeIn(
@@ -232,7 +238,7 @@ fun MainScreen(
                     easing = FastOutSlowInEasing
                 )
             ) + slideInHorizontally(
-                initialOffsetX = { if (targetState != null) it / 4 else -it / 4 },
+                initialOffsetX = { it / 4 },
                 animationSpec = tween(
                     durationMillis = 300,
                     easing = FastOutSlowInEasing
@@ -245,7 +251,7 @@ fun MainScreen(
                     easing = FastOutSlowInEasing
                 )
             ) + slideOutHorizontally(
-                targetOffsetX = { if (targetState != null) -it / 6 else it / 6 },
+                targetOffsetX = { -it / 6 },
                 animationSpec = tween(
                     durationMillis = 300,
                     easing = FastOutSlowInEasing
@@ -254,58 +260,75 @@ fun MainScreen(
             
             enterAnim togetherWith exitAnim using SizeTransform(clip = false)
         },
-        label = "chatNavigation"
-    ) { user ->
-        if (user != null) {
-            // Экран чата
-            ChatDetailScreen(
-                user = user,
-                currentUserPublicKey = accountPublicKey,
-                currentUserPrivateKey = accountPrivateKey,
-                isDarkTheme = isDarkTheme,
-                onBack = { selectedUser = null }
-            )
-        } else {
-            // Список чатов
-            ChatsListScreen(
-                isDarkTheme = isDarkTheme,
-                accountName = accountName,
-                accountPhone = accountPhone,
-                accountPublicKey = accountPublicKey,
-                privateKeyHash = privateKeyHash,
-                onToggleTheme = onToggleTheme,
-                onProfileClick = {
-                    // TODO: Navigate to profile
-                },
-                onNewGroupClick = {
-                    // TODO: Navigate to new group
-                },
-                onContactsClick = {
-                    // TODO: Navigate to contacts
-                },
-                onCallsClick = {
-                    // TODO: Navigate to calls
-                },
-                onSavedMessagesClick = {
-                    // TODO: Navigate to saved messages
-                },
-                onSettingsClick = {
-                    // TODO: Navigate to settings
-                },
-                onInviteFriendsClick = {
-                    // TODO: Share invite link
-                },
-                onSearchClick = {
-                    // TODO: Show search
-                },
-                onNewChat = {
-                    // TODO: Show new chat screen
-                },
-                onUserSelect = { user ->
-                    selectedUser = user
-                },
-                onLogout = onLogout
-            )
+        label = "screenNavigation"
+    ) { (user, isSearchOpen, _) ->
+        when {
+            user != null -> {
+                // Экран чата
+                ChatDetailScreen(
+                    user = user,
+                    currentUserPublicKey = accountPublicKey,
+                    currentUserPrivateKey = accountPrivateKey,
+                    isDarkTheme = isDarkTheme,
+                    onBack = { selectedUser = null }
+                )
+            }
+            isSearchOpen -> {
+                // Экран поиска
+                SearchScreen(
+                    privateKeyHash = privateKeyHash,
+                    currentUserPublicKey = accountPublicKey,
+                    isDarkTheme = isDarkTheme,
+                    protocolState = protocolState,
+                    onBackClick = { showSearchScreen = false },
+                    onUserSelect = { user ->
+                        showSearchScreen = false
+                        selectedUser = user
+                    }
+                )
+            }
+            else -> {
+                // Список чатов
+                ChatsListScreen(
+                    isDarkTheme = isDarkTheme,
+                    accountName = accountName,
+                    accountPhone = accountPhone,
+                    accountPublicKey = accountPublicKey,
+                    privateKeyHash = privateKeyHash,
+                    onToggleTheme = onToggleTheme,
+                    onProfileClick = {
+                        // TODO: Navigate to profile
+                    },
+                    onNewGroupClick = {
+                        // TODO: Navigate to new group
+                    },
+                    onContactsClick = {
+                        // TODO: Navigate to contacts
+                    },
+                    onCallsClick = {
+                        // TODO: Navigate to calls
+                    },
+                    onSavedMessagesClick = {
+                        // TODO: Navigate to saved messages
+                    },
+                    onSettingsClick = {
+                        // TODO: Navigate to settings
+                    },
+                    onInviteFriendsClick = {
+                        // TODO: Share invite link
+                    },
+                    onSearchClick = {
+                        showSearchScreen = true
+                    },
+                    onNewChat = {
+                        // TODO: Show new chat screen
+                    },
+                    onUserSelect = { user ->
+                        selectedUser = user
+                    },
+                    onLogout = onLogout
+                )
+            }
         }
     }
 }