Mobile: remove unintended artwork opacity overlay

[dylanjeffers]

Problem

Track tile artwork was being rendered with an unintended opacity/overlay effect that made images look washed out (lightened in dark mode, darkened in light mode).

Fix

• Updated packages/mobile/src/harmony-native/components/Artwork.tsx to stop applying a global animated opacity on the image.
• Removed the default semi-transparent scrim that was applied when children were present.

This keeps artwork fully opaque by default; any intentional dimming should be applied explicitly by the caller.

Notes

Local tests/lint were not run in this agent VM because the repo preinstall script requires pyenv (not available here).

  

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Latest commit: 5b4deb9

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