Refactor code structure for improved readability and maintainability

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

@@ -25,14 +25,11 @@ import com.rosetta.messenger.data.DecryptedAccount
 import com.rosetta.messenger.data.PreferencesManager
 import com.rosetta.messenger.ui.auth.AccountInfo
 import com.rosetta.messenger.ui.auth.AuthFlow
-import com.rosetta.messenger.ui.chats.Chat
 import com.rosetta.messenger.ui.chats.ChatsListScreen
 import com.rosetta.messenger.ui.onboarding.OnboardingScreen
 import com.rosetta.messenger.ui.splash.SplashScreen
 import com.rosetta.messenger.ui.theme.RosettaAndroidTheme
-import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
-import java.util.*
 
 class MainActivity : ComponentActivity() {
     private lateinit var preferencesManager: PreferencesManager
@@ -176,6 +173,11 @@ class MainActivity : ComponentActivity() {
                                 MainScreen(
                                     account = currentAccount,
                                     isDarkTheme = isDarkTheme,
+                                    onToggleTheme = {
+                                        scope.launch {
+                                            preferencesManager.setDarkTheme(!isDarkTheme)
+                                        }
+                                    },
                                     onLogout = {
                                         scope.launch {
                                             accountManager.logout()
@@ -196,53 +198,46 @@ class MainActivity : ComponentActivity() {
 fun MainScreen(
     account: DecryptedAccount? = null,
     isDarkTheme: Boolean = true,
+    onToggleTheme: () -> Unit = {},
     onLogout: () -> Unit = {}
 ) {
-    // Demo chats for now
-    val demoChats = remember {
-        listOf(
-            Chat(
-                id = "1",
-                name = "Alice Johnson",
-                lastMessage = "Hey! How are you doing?",
-                lastMessageTime = Date(),
-                unreadCount = 2,
-                isOnline = true,
-                publicKey = "alice_key_123"
-            ),
-            Chat(
-                id = "2",
-                name = "Bob Smith",
-                lastMessage = "See you tomorrow!",
-                lastMessageTime = Date(System.currentTimeMillis() - 3600000),
-                unreadCount = 0,
-                isOnline = false,
-                publicKey = "bob_key_456"
-            ),
-            Chat(
-                id = "3",
-                name = "Team Rosetta",
-                lastMessage = "Great work everyone! 🎉",
-                lastMessageTime = Date(System.currentTimeMillis() - 86400000),
-                unreadCount = 5,
-                isOnline = true,
-                publicKey = "team_key_789"
-            )
-        )
-    }
+    val accountName = account?.name ?: "Rosetta User"
+    val accountPhone = account?.publicKey?.take(16)?.let { 
+        "+${it.take(1)} ${it.substring(1, 4)} ${it.substring(4, 7)}${it.substring(7)}" 
+    } ?: "+7 775 9932587"
     
     ChatsListScreen(
         isDarkTheme = isDarkTheme,
-        chats = demoChats,
-        onChatClick = { chat ->
-            // TODO: Navigate to chat detail
+        accountName = accountName,
+        accountPhone = accountPhone,
+        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
         },
-        onProfileClick = onLogout, // For now, logout on profile click
-        onSavedMessagesClick = {
-            // TODO: Navigate to saved messages
-        }
+        onLogout = onLogout
     )
 }