feat: Update send icon to ArrowUp in TelegramCaptionBar and MultiImageEditorScreen

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

@@ -551,6 +551,7 @@ fun MainScreen(
     // Appearance: background blur color preference
     val prefsManager = remember { com.rosetta.messenger.data.PreferencesManager(context) }
     val backgroundBlurColorId by prefsManager.backgroundBlurColorId.collectAsState(initial = "avatar")
+    val pinnedChats by prefsManager.pinnedChats.collectAsState(initial = emptySet())
     
     // AvatarRepository для работы с аватарами
     val avatarRepository = remember(accountPublicKey) {
@@ -614,6 +615,12 @@ fun MainScreen(
                 },
                 onUserSelect = { selectedChatUser -> selectedUser = selectedChatUser },
                 backgroundBlurColorId = backgroundBlurColorId,
+                pinnedChats = pinnedChats,
+                onTogglePin = { opponentKey ->
+                    mainScreenScope.launch {
+                        prefsManager.togglePinChat(opponentKey)
+                    }
+                },
                 avatarRepository = avatarRepository,
                 onLogout = onLogout
             )
@@ -905,8 +912,7 @@ fun MainScreen(
                         showOtherProfileScreen = false
                         selectedOtherUser = null
                     },
-                    avatarRepository = avatarRepository,
-                    backgroundBlurColorId = backgroundBlurColorId
+                    avatarRepository = avatarRepository
                 )
             }
         }