[BUG] Linux and MacOS need bundled UI fonts

[Meteoni]

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• I have searched for my issue and have not found a work-in-progress/duplicate/resolved issue.
• I have tested that this issue has not been fixed in the latest (beta or stable) release.
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UniGetUI Version

Current

Windows version, edition, and architecture

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Describe your issue

Currently, UniGetUI explicitly manages its default UI font on Windows through UiFontPolicy, while on Linux and macOS it leaves the font unspecified and lets Avalonia resolve the platform default.

This is reasonable from a native-platform perspective, but it also means UniGetUI's typography can vary substantially depending on the Linux distribution, desktop environment, installed fonts, and fontconfig configuration. Since much of the UI was originally designed around Segoe UI/WinUI metrics, some system defaults can make spacing, control sizing, and the overall appearance noticeably different.

Would it make sense to bundle a known UI font with the Avalonia application and use it as the default on Linux and macOS?

For example, an OFL-licensed font such as Selawik or Inter could be shipped as an application resource. Windows could continue using the existing Segoe UI-based logic, while Linux and macOS would get a predictable primary font regardless of what is installed on the host.

Steps to reproduce the issue

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UniGetUI Log

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Package Managers Logs

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Relevant information

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Screenshots and videos

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