Implement 40250 classic client port

project/private_shop_ui_test.gd

@@ -67,6 +67,8 @@ func _run() -> void:
 	_ck(pu._cells.size() == 40, "ItemSlot = 40-slot grid (5x8, shop.SHOP_SLOT_COUNT)")
 	_ck(is_instance_valid(pu._sign), "NameLine overlaid with a LineEdit")
 	_ck(pu._inv_list.get_child_count() == 2, "2 inventory candidates")
+	_ck((pu._inv_list.get_child(0) as Button).has_method("_get_drag_data"),
+			"inventory candidate supports drag data")
 
 	# 未上货 → 개설 무동작
 	pu._ok()
@@ -81,6 +83,10 @@ func _run() -> void:
 	_ck(pu._stock.has(3) and int(pu._stock[3]["price"]) == 250000, "stock[3] placed")
 	_ck(pu._picked == null, "pick cleared after place")
 	_ck(pu._inv_list.get_child_count() == 1, "placed item leaves candidate list")
+	# 标准 Godot 拖放入口与点击选取共用同一个落位逻辑。
+	pu._drop_slot(Vector2.ZERO, {"private_shop_entry": {"cell": 5, "vnum": 27993, "count": 3}}, 6)
+	_ck(is_instance_valid(pu._price_dialog), "dragging candidate onto empty slot opens price dialog")
+	pu._place(6, 100)
 
 	# 拿起第 2 件（cell 5）→ 落到格 0（更小格号 → 排前）
 	(pu._inv_list.get_child(0) as Button).pressed.emit()