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/test_skill_ground_fix.gd

@@ -47,7 +47,7 @@ func get_skills() -> Array: return [{"id": 1, "level": 5, "master": 0}]
 func use_skill(id: int, vid: int) -> bool:
 	uses.append([id, vid])
 	return true
-func cast_skill(mi: int, yaw: float, x: int, y: int) -> bool:
+func cast_skill(mi: int, yaw: float, x: int, y: int, _arg: int = 0) -> bool:
 	casts.append([mi, yaw, x, y])
 	return true
 func quickslot_add(_slot: int, _type: int, _id: int) -> bool:
@@ -60,7 +60,9 @@ func quickslot_add(_slot: int, _type: int, _id: int) -> bool:
 	var qb := Quickbar.new()
 	get_root().add_child(qb)
 	qb.setup(client_mock, st, ui, func() -> Node: return player)
-	qb.assign(0, "skill", 1) # Skill 1: samyeon (no target required)
+	# This fixture has no server quickslot callback; seed a local-only slot so
+	# the movement/heading assertions do not bypass the GC_QUICKSLOT contract.
+	qb.assign(0, "skill", 1, false) # Skill 1: samyeon (no target required)
 
 	qb.activate(0)