Feat: Ppt button preview

[CJKmkp]

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds a dedicated settings subpage for PowerPoint page-turn (flip) buttons with an in-page visual preview.

Changes:

• Introduced PPTFlipButtonSettingsPage (XAML + code-behind) that previews all four button positions and exposes per-position settings (enable, offset, opacity, page number, background) plus global options.
• Refactored PowerPointPage to replace the large inline flip-button configuration UI with a single “Configure” entry that navigates to the new subpage.
• Registered the new page in SettingsWindow navigation maps so it can be routed via NavigateToPage.
• Added new localized resource strings (zh-CN default, zh-ME, en-US) for the new UI labels and hint text.

Technical Notes: The preview renders PPTNavBar instances scaled/positioned from persisted PowerPointSettings, and updates propagate through SettingsManager plus SettingsActionHub notifications.

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[augmentcode]

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[augmentcode]

CheckboxShowPageNumber_Changed (and similarly CheckboxBlackBackground_Changed) indexes directly into PPTSButtonsOption/PPTBButtonsOption char arrays (e.g., c[0], c[2]) without validating length; if an older/manual-edited settings value stringifies to fewer digits, this can throw IndexOutOfRangeException and break the settings UI.

Severity: medium

Other Locations

• Ink Canvas/Windows/SettingsViews/Pages/PPTFlipButtonSettingsPage.xaml.cs:423

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[CJKmkp]

啊这