修复管理页面加载样式不统一的问题

[CiiLu]

原先模组、资源包管理为刷新时只有 ListView 加载
世界、原理图管理为整个页面加载，感觉不太统一

本 PR 将这些地方统一为了只有 ListView 加载

[Copilot]

Pull request overview

This pull request fixes inconsistent loading styles in management pages by refactoring ResourcepackListPage to use the standardized ToolbarListPageSkin base class, ensuring that only the ListView displays loading indicators rather than the entire page.

Changes:

• Refactored ResourcepackListPage to extend ToolbarListPageSkin instead of implementing a custom skin
• Modified ToolbarListPageSkin's hierarchy to wrap only the ListView with SpinnerPane, keeping the toolbar always visible during loading

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ResourcepackListPage.java	Refactored custom skin implementation to extend ToolbarListPageSkin, reducing code duplication and aligning with other management pages
ToolbarListPageSkin.java	Restructured component hierarchy so SpinnerPane wraps only the ListView instead of the entire page, unifying loading behavior across all pages

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