feat(client): 完成40250客户端核心功能1:1对齐与桥梁高度采样修复

- 桥梁与静态物体高度采样修复：
  - 严格对齐 40250 CMapOutdoor::GetHeight 与 CAttributeInstance::GetHeight
  - 解析 .mdatr 中的 AttributeHeight 网格，使用 is_in_triangle_2d 准确计算桥面多边形平面方程
  - sample_height 查询邻近区块并返回 fMAX(fObjectHeight, fTerrainHeight)，彻底解决走上桥面穿透掉入水底/河床的问题
  - 新增 test_bridge_height_parity.gd 自动化对拍测试
- 40250 怪物击杀经验动效：
  - 1:1 实现 FLY_EXP(0) / FLY_HP / FLY_SP 粒子轨迹与爆炸吸附
- 40250 客户端全系统功能对齐（Batches 1-31）：
  - 包含公会、交易、骑乘、变身、钓鱼、采矿、商城、信件、结婚、地牢等 134 套对拍系统与自动化回归测试
- 文档沉淀：
  - 新增 docs/CLIENT-PARITY-AUDIT-AND-FIX-GUIDE.md 客户端对拍缺陷发现与修复工程指南

project/ui/inventory_ui.gd

@@ -28,6 +28,10 @@ var context_consumer: Callable = Callable()
 const UiAssets = preload("res://ui/ui_assets.gd")
 const EquipRules = preload("res://equip_rules.gd")
 const ItemTooltip = preload("res://ui/item_tooltip.gd")
+const ChestSystem = preload("res://chest_system.gd")
+const ItemAttrSystem = preload("res://item_attr_system.gd")
+const MetinSocketSystem = preload("res://metin_socket_system.gd")
+const ConsumableSystem = preload("res://consumable_system.gd")
 
 const EQUIP_BASE := 90       # uiscript EQUIPMENT_START_INDEX
 const BELT_BASE := 200       # 仅 UI 内部索引，避免与旧 slot_index 相撞
@@ -94,6 +98,11 @@ func setup(ui_manager: CanvasLayer, m2client: Node, proto_node: Node, assets: St
 		uiscript_dir = assets.path_join("uiscript")
 	if client and client.has_signal("inventory_changed"):
 		client.inventory_changed.connect(_on_inv_changed)
+	if ui and ui.has_signal("window_closed"):
+		ui.window_closed.connect(func(w):
+			if not _win.is_empty() and _win.get("root") == w:
+				close()
+		)
 	set_process_input(true)
 
 func is_open() -> bool:
@@ -127,13 +136,14 @@ func close() -> void:
 		item_mouse.unregister_owner(self)
 		if item_mouse.has_method("is_attached") and item_mouse.is_attached():
 			item_mouse.cancel()
-	if is_open():
-		ui.close(_win["root"])
+	var r: Control = _win.get("root", null)
 	_win = {}
 	_cells.clear()
 	_combine_from = -1
 	_mobile_selected_ui = -1
 	_hint = null
+	if r and is_instance_valid(r) and ui:
+		ui.close(r)
 
 func open() -> void:
 	if is_open():
@@ -147,6 +157,7 @@ func open() -> void:
 	_add_extended_cells(_win["root"])
 	_wire_cells()
 	_wire_money()
+	_wire_mall_button()
 	refresh()
 
 # --- 填充 ---------------------------------------------------------------
@@ -258,6 +269,14 @@ func _wire_money() -> void:
 	else:
 		_money_button = null
 
+func _wire_mall_button() -> void:
+	var mall_btn = _win.get("nodes", {}).get("MallButton", null)
+	if mall_btn is BaseButton:
+		mall_btn.pressed.connect(func():
+			if client and client.has_method("say"):
+				client.say(0, "/click_mall")
+		)
+
 func _current_gold() -> int:
 	if client and client.has_method("get_points"):
 		return maxi(0, int(client.get_points().get("gold", 0)))
@@ -623,6 +642,16 @@ func _drop_mouse_item(payload: Dictionary, target_ui: int) -> bool:
 			and client.mall_checkout(source_cell, target[0], target[1])
 	if source_window not in [WINDOW_INVENTORY, 2]:
 		return false
+	var target_cell_node: Panel = _cells.get(target_ui, null)
+	var target_vnum := int(target_cell_node.get_meta("vnum", 0)) if target_cell_node else 0
+	var source_vnum := int(payload.get("vnum", 0))
+	if target_vnum != 0 and source_vnum != 0:
+		if ChestSystem.is_treasure_key(source_vnum) and ChestSystem.is_treasure_box(target_vnum):
+			if client and client.has_method("use_item_to_item"):
+				return client.use_item_to_item(source_window, source_cell, int(target[0]), int(target[1]))
+		if ItemAttrSystem.is_attr_scroll(source_vnum) or MetinSocketSystem.is_metin_stone(source_vnum) or MetinSocketSystem.is_clean_socket_scroll(source_vnum):
+			if client and client.has_method("use_item_to_item"):
+				return client.use_item_to_item(source_window, source_cell, int(target[0]), int(target[1]))
 	return move_wire(source_window, source_cell, int(target[0]), int(target[1]),
 			maxi(1, int(payload.get("count", 1))))