feat: Add support for retrieving and displaying attachment types in chat messages

app/src/main/java/com/rosetta/messenger/database/MessageEntities.kt

@@ -359,6 +359,19 @@ interface MessageDao {
         ORDER BY timestamp DESC, id DESC LIMIT 1
     """)
     suspend fun getLastMessageStatus(account: String, opponent: String): LastMessageStatus?
+    
+    /**
+     * 📎 Получить attachments последнего сообщения для диалога
+     * Возвращает null если сообщений нет или нет attachments
+     */
+    @Query("""
+        SELECT attachments FROM messages 
+        WHERE account = :account 
+          AND ((from_public_key = :opponent AND to_public_key = :account) 
+            OR (from_public_key = :account AND to_public_key = :opponent))
+        ORDER BY timestamp DESC, id DESC LIMIT 1
+    """)
+    suspend fun getLastMessageAttachments(account: String, opponent: String): String?
 }
 
 /**