feat: Enhance back navigation in AuthFlow and add back button in WelcomeScreen for better user experience

app/src/main/java/com/rosetta/messenger/ui/chats/ChatsListScreen.kt

@@ -436,8 +436,12 @@ fun ChatsListScreen(
                         .clip(RoundedCornerShape(12.dp))
                         .background(Color(0x20FF3B30))
                         .clickable {
-                            scope.launch { drawerState.close() }
-                            onLogout()
+                            scope.launch { 
+                                drawerState.close()
+                                // Wait for drawer to close before logout
+                                kotlinx.coroutines.delay(150)
+                                onLogout()
+                            }
                         }
                         .padding(horizontal = 16.dp, vertical = 12.dp),
                     verticalAlignment = Alignment.CenterVertically
@@ -484,6 +488,7 @@ fun ChatsListScreen(
                         animationSpec = tween(400)
                     )
                 ) {
+                    key(isDarkTheme) {
                     TopAppBar(
                         navigationIcon = {
                             IconButton(
@@ -704,6 +709,7 @@ fun ChatsListScreen(
                             actionIconContentColor = textColor
                         )
                     )
+                    }
                 }
             },
             floatingActionButton = {