xammen3/16/2026, 4:40:13 PM

- Segmented tab bar: [Dynamic] [Presets] [Custom] with progressive disclosure
- Hero preview: enlarged live slider preview, always visible, with Randomize button
- Presets tab: 2-column visual theme cards with mini-slider visualization
- Category filter pills: All/Minimal/Brands/Retro/Developer/Nature/Accessibility
- Selected theme: brand accent border (#FFC857) highlight
- Custom tab: organized color swatches (Slider Colors + Window Colors groups)
- My Themes: overflow '...' menu hiding Import/Export, clean save UX
- Empty state text for no saved themes
- RandomizeColors: HSV-based coherent palette generation from random hue
- SelectedTab/SelectedCategory/FilteredThemes ViewModel properties
- All existing functionality preserved (color picker, themes, import/export)

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