[Enhancement] 下载界面简介不滚动

[Calboot]

2026-02-06.16.11.21.mov

上面为更改前，下面为更改后

会受到 #5421 影响

[Copilot]

Pull request overview

This PR adjusts the mod download details layout so the top “introduction/description” section stays fixed while only the version list scrolls, addressing the UX issue shown in the attachment and noting interaction with #5421 (ScrollPane rounded-corner behavior while scrolling).

Changes:

• Removed the outer ScrollPane that wrapped the whole page content.
• Wrapped the versions ComponentList inside a new ScrollPane and set it as the SpinnerPane content.
• Updated the root skin content to render the VBox pane directly instead of the old outer scroll container.

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[Copilot]

After removing the outer ScrollPane, the header/description area is no longer scrollable. Because content.getSubtitleLabel().setWrapText(true) and descriptionPane.setMinHeight(Region.USE_PREF_SIZE), a long mod description can grow the header to its full preferred height and leave the versions list with little/zero visible space, with no way to scroll to the list. Consider constraining the description area (e.g., cap its max height / clamp subtitle lines / remove the USE_PREF_SIZE min-height so it can shrink) so the versions list remains reachable at small window heights or with long descriptions.

Suggested change

descriptionPane.setMinHeight(Region.USE_PREF_SIZE);