refactor: remove drag and drop from the objects tree

Decided during manual testing: the legacy drop-inside zone had zero
height, so drops only worked before/after a node and moves happened by
accident. Sections are re-parented via Edit, as before.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/webparts/stroyBot/pages/objects/texts.ts

@@ -58,7 +58,6 @@ export const OBJECTS_TEXTS = {
   deleteFallbackTitle: (id: number): string => `ID ${id}`,
   serverError: (status: number): string => `Ошибка сервера: ${status}`,
   saveError: (message: string): string => `Ошибка сохранения: ${message}`,
-  moveError: (message: string): string => `Не удалось переместить: ${message}`,
   deleteError: (message: string): string => `Не удалось удалить: ${message}`,
   exportError: (message: string): string => `Не удалось скачать файл: ${message}`
 } as const;