修复 popup 第一次无法计算高度的问题 & 应用此方法到世界管理界面

[pynickle]

Close #4287

[Copilot]

Pull Request Overview

Fixes the issue where popup menus cannot calculate height properly on first display and applies this solution to the world management interface. The PR moves popup position calculation logic to a shared utility method and enhances it to handle first-time popup displays.

• Moved popup position determination logic from GameListItemSkin to FXUtils as a shared utility
• Enhanced the method to handle first-time popup height calculation by forcing layout measurement
• Applied the improved popup positioning to WorldListItemSkin

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
FXUtils.java	Added determineOptimalPopupPosition method with enhanced height calculation for first-time popup display
GameListItemSkin.java	Removed duplicate popup positioning logic and updated to use the new shared utility method
WorldListItemSkin.java	Applied the improved popup positioning logic to world management interface

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