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Four preset color themes, switchable from Profile settings with instant preview and server-side persistence (User.theme, applied via a data-theme attribute the CSS custom-property overrides in themes.css key off). Dark stays the existing DarkSingularity palette and default. Light is a genuine new light-mode design; Midnight is a higher-contrast OLED-friendly dark variant; Sunset swaps in a warm amber/coral accent family. Custom theme building (pick-your-own-colors) is out of scope for this pass -- presets only. Also: fixed the PATCH /api/auth/me handler to only apply fields actually present in the request body. It previously always overwrote display_name unconditionally, which happened to be harmless when it was the only field on ProfileUpdate but would have silently cleared it on any theme-only update. And switched two hardcoded hex colors (.btn-primary:hover, .role-badge-admin) to token-derived color-mix() values so they adapt across themes instead of staying fixed to the original cyan/violet palette. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>