Expose pinned messages through iOS FFI

crates/tele-core/src/session.rs

@@ -218,6 +218,13 @@ impl<C: TdClientTrait> CoreSession<C> {
             .collect())
     }
 
+    pub async fn pinned_messages(&mut self, chat_id: ChatId) -> Result<Vec<CoreMessage>, String> {
+        self.client
+            .get_pinned_messages(chat_id)
+            .await
+            .map(|messages| messages.iter().map(CoreMessage::from).collect())
+    }
+
     pub async fn copy_payload(
         &mut self,
         chat_id: ChatId,
@@ -907,6 +914,24 @@ mod tests {
         );
     }
 
+    #[tokio::test]
+    async fn pinned_messages_are_mapped_for_native_clients() {
+        let chat_id = ChatId::new(42);
+        let pinned = MessageBuilder::new(MessageId::new(10))
+            .sender_name("Alice")
+            .text("Pinned")
+            .build();
+        let mut client = FakeTdClient::new();
+        client.set_current_pinned_message(Some(pinned));
+        let mut session = CoreSession::new(client);
+
+        let pinned = session.pinned_messages(chat_id).await.unwrap();
+
+        assert_eq!(pinned.len(), 1);
+        assert_eq!(pinned[0].id, MessageId::new(10));
+        assert_eq!(pinned[0].text, "Pinned");
+    }
+
     #[tokio::test]
     async fn facade_delegates_auth_forward_reactions_and_downloads() {
         let chat_id = ChatId::new(42);