feat: Implement block/unblock user functionality with confirmation dialogs in ChatDetailScreen

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

@@ -195,6 +195,18 @@ interface MessageDao {
     @Query("DELETE FROM messages WHERE account = :account AND dialog_key = :dialogKey")
     suspend fun deleteDialog(account: String, dialogKey: String)
     
+    /**
+     * Удалить все сообщения между двумя пользователями
+     */
+    @Query("""
+        DELETE FROM messages 
+        WHERE account = :account AND (
+            (from_public_key = :user1 AND to_public_key = :user2) OR 
+            (from_public_key = :user2 AND to_public_key = :user1)
+        )
+    """)
+    suspend fun deleteMessagesBetweenUsers(account: String, user1: String, user2: String)
+    
     /**
      * Количество непрочитанных сообщений в диалоге
      */