style(widget): refine RestoreTipWidget appearance

[add-uos]

Adjust close button size (28->16), corner radius (8->12), minimum width (300->336) and add a subtle border for the restore tip widget.

调整恢复提示控件的关闭按钮尺寸、圆角、最小宽度并增加细边框。

Log: 优化恢复提示控件外观
PMS: BUG-390571
Influence: 仅影响恢复提示控件的视觉效果，无功能变更。

Summary by Sourcery

Enhancements:

• Refine the restore tip widget’s visual styling with a smaller close button, wider layout, rounder corners, and a subtle border.

[sourcery-ai]

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates RestoreTipWidget sizing and painting only: the close button is smaller, the widget is wider with more rounded corners, and its background now has a subtle border; no functional behavior changes are introduced.

File-Level Changes

Change	Details	Files
Refine the widget’s dimensions and shape styling to match the updated visual specification.	Reduce the close button’s fixed size while preserving its 16px icon. Increase the widget minimum width and corner radius. Add a subtle semi-transparent black border drawn inside the rounded background.	reader/widgets/RestoreTipWidget.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, lzwind

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• debian/deepin/OWNERS

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[add-uos]

/forcemerge

[deepin-bot]

This pr force merged! (status: unstable)