fix: 装备属性面板避让逻辑 + 多项功能更新

- item_tooltip_view.gd: 新增 avoid_rect 属性，tooltip 与装备窗口重叠时自动推到左侧
- inventory_ui.gd: 悬停装备时传入窗口矩形作为避让区域
- 包含其他累积的功能开发和测试文件

project/disconnect_world_reset_test.gd

@@ -0,0 +1,35 @@
+# disconnect_world_reset_test —— 40250 SetOffLinePhase/Destroy 清理边界。
+# 显式断开不能只销毁 socket；保留 GameScene 时必须通知 presentation owner 清空旧世界。
+extends SceneTree
+
+var _failures := 0
+
+func _check(ok: bool, message: String) -> void:
+	if not ok:
+		_failures += 1
+		printerr("FAIL: " + message)
+
+func _init() -> void:
+	var client := M2Client.new()
+	get_root().add_child(client)
+	var resets := [0]
+	client.world_reset.connect(func() -> void:
+		resets[0] += 1)
+
+	# The client is offline here, so this checks the public lifecycle contract:
+	# explicit disconnect always gives the retained scene one synchronous reset
+	# notification, while remaining idempotent at the transport layer.
+	client.disconnect_from_server()
+	_check(resets[0] == 1,
+			"explicit disconnect emits one world_reset for retained scene cleanup")
+	client.disconnect_from_server()
+	_check(resets[0] == 2,
+			"repeated explicit disconnect emits one reset per lifecycle boundary")
+
+	client.free()
+	if _failures == 0:
+		print("PASS: disconnect_world_reset_test")
+		quit(0)
+	else:
+		printerr("%d check(s) failed" % _failures)
+		quit(1)