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"@gsxdsm/fusion": minor
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Add light mode toggle and theme selector with 8+ attractive color themes

- New theme modes: Dark, Light, and System (follows OS preference)
- 8 color themes: Default, Ocean, Forest, Sunset, Berry, Monochrome, High Contrast, and Solarized
- Quick theme toggle button in header
- Full theme selector in Settings > Appearance
- Theme preferences persist to localStorage
- No-FOUC inline script ensures correct theme before page render