- Fix z-index issue by creating separate CSS classes for inline vs dropdown color pickers
- Unify CalDAV and external calendar color pickers to use same grid interface
- Improve color picker styling with 4x4 grid layout for 16 colors
- Enhance color option appearance with proper border centering and sizing
- Replace native HTML color input with consistent predefined color grid
- Add visual improvements: larger swatches, better hover effects, checkmark selection
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Co-Authored-By: Claude <noreply@anthropic.com>
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