feat: Update ProfileNavigationItem to use a rounded corner shape with increased radius

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

@@ -19,6 +19,7 @@ import androidx.compose.material3.Surface
 import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import com.google.firebase.FirebaseApp
@@ -436,6 +437,21 @@ fun MainScreen(
     val accountPublicKey = account?.publicKey ?: "04c266b98ae5"
     val accountPrivateKey = account?.privateKey ?: ""
     val privateKeyHash = account?.privateKeyHash ?: ""
+    
+    // Username state - загружается из EncryptedAccount
+    var accountUsername by remember { mutableStateOf("") }
+    var reloadTrigger by remember { mutableIntStateOf(0) }
+    
+    // Load username from AccountManager
+    val context = LocalContext.current
+    LaunchedEffect(accountPublicKey, reloadTrigger) {
+        if (accountPublicKey.isNotBlank() && accountPublicKey != "04c266b98ae5") {
+            val accountManager = AccountManager(context)
+            val encryptedAccount = accountManager.getAccount(accountPublicKey)
+            accountUsername = encryptedAccount?.username ?: ""
+            Log.d("MainActivity", "Loaded username from DB: $accountUsername")
+        }
+    }
 
     // Состояние протокола для передачи в SearchScreen
     val protocolState by ProtocolManager.state.collectAsState()
@@ -660,13 +676,15 @@ fun MainScreen(
                 ProfileScreen(
                         isDarkTheme = isDarkTheme,
                         accountName = accountName,
-                        accountUsername = "", // TODO: Get from account
+                        accountUsername = accountUsername,
                         accountPublicKey = accountPublicKey,
                         accountPrivateKeyHash = privateKeyHash,
                         onBack = { showProfileScreen = false },
                         onSaveProfile = { name, username ->
-                            // Profile saved via ViewModel
-                            Log.d("MainActivity", "Profile saved: name=$name, username=$username")
+                            // Update username state and trigger reload from DB
+                            accountUsername = username
+                            reloadTrigger++
+                            Log.d("MainActivity", "Profile saved: name=$name, username=$username, reloading...")
                         },
                         onLogout = onLogout,
                         onNavigateToTheme = {