fix: Use FontSynthesis.All as the default in toSkTextStyle (nonAndroid target)

[adamglin0 (adamglin0)]

toSkTextStyle fell back to FontSynthesis.None when the style had no fontSynthesis, while the StyleAdd pre-resolve and resolveFontFamily paths fell back to FontSynthesis.All. The mismatch produced two different TypefaceRequest keys for the same style and fragmented the font resolver cache. Align on All, which is also the Android default.

Describe proposed changes and the issue being fixed

Testing

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(Optional) This should be tested by QA

Release Notes

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• Describe change in format https://github.com/JetBrains/compose-multiplatform/blob/master/tools/changelog/PR_FORMAT.md
  • Sections: Highlights, Known Issues, Breaking Changes, Migration Notes, Features, Fixes
  • Subsections: Multiple Platforms, iOS, Desktop, Web, Android, Resources, Gradle Plugin, Lifecycle, Navigation, SavedState

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[Vladimir Mazunin (mazunin-v-jb)]

Hi!
Could you please clean up the PR description and add the Release Notes?
For Testing it's fine to use something like "N/A since there are no testable changes"