favicon.svg now uses currentColor + prefers-color-scheme so a single
asset adapts to light/dark. Removed unused .ico/.png and 512 raster;
192 PNG kept and regenerated for apple-touch-icon and PWA maskable.
Add theme cycling (system/light/dark) with localStorage persistence
and FOUC prevention. Restructure CSS color tokens to respond to
data-theme attribute across all components. Redesign header as a
floating glass pill bar with smooth view transitions including
clip-reveal logo animation.
Alexander
