- Add WCAG-compliant luminance calculation to Color extension
- Add contrastingTextColor method to MoodTints for automatic black/white text
- Update 12+ entry styles to use dynamic text colors instead of hardcoded white
- Change theme preview sheet to full screen presentation
Text now automatically switches between black and white based on background
brightness, fixing readability issues on light mood colors like yellow (Good).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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