Fix: Lock AccountListItemSkin.btnRefresh width to prevent layout shifting

[KSSJW]

修复了AccountListItemSkin中刷新按钮在showSpinner后大小更改的问题

问题复现

_20260711_131828.mp4

[KSSJW]

/gemini review

[gemini-code-assist]

Code Review

This pull request sets a preferred size of 30.0x30.0 on the spinnerRefresh component in AccountListItemSkin.java. It is recommended to define these dimensions in the CSS stylesheet under the .small-spinner-pane class instead of hardcoding them in Java to improve maintainability and ensure consistent layout behavior across other components using the same class.

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[gemini-code-assist]

Instead of hardcoding the preferred size of spinnerRefresh in Java code, it is more maintainable and consistent to define these dimensions in the CSS stylesheet under the .small-spinner-pane class (e.g., using -fx-pref-width: 30px; -fx-pref-height: 30px;). This ensures that all components using .small-spinner-pane (such as spinnerMove and spinnerUpload) behave consistently and avoid layout shifting without duplicating layout code in Java.

[KSSJW]

setPrefSize(30.0, 30.0)是因为前面还使用了newToggleButton4（对应 CSS toggle-icon4）

.toggle-icon4 {
    -fx-toggle-icon4-size: 30px;
    -fx-pref-width: -fx-toggle-icon4-size;
    -fx-max-width: -fx-toggle-icon4-size;
    -fx-min-width: -fx-toggle-icon4-size;
    -fx-pref-height: -fx-toggle-icon4-size;
    -fx-max-height: -fx-toggle-icon4-size;
    -fx-min-height: -fx-toggle-icon4-size;
    ...
}

若更改 CSS small-spinner-pane ，则其他使用了该样式的组件也会受影响（例如DownloadDiscoJava），即使他们 没有 使用 toggle-icon4

[KSSJW]

Reviewed