Replace ~268 hardcoded text-stone-* classes with theme-aware token
utilities (text-text, text-text-secondary, text-text-muted) across all
templates and JS components. Adjust dark mode token values to meet
WCAG AA contrast ratios on dark surfaces.
Move CSS, JS, favicon files to static/ directory to separate
compiled-in assets from Askama templates. Update all include paths,
build.rs, flake.nix, and Tailwind @source directives.
