- Dark mode via prefers-color-scheme: pure CSS, no JS, follows OS setting
- CSS custom properties for all colors; dark palette redefines variables
- Nav: brand is now a home link, Dashboard link removed, nowrap keeps
it single-line on mobile; compact padding at 640px breakpoint
- Battery health % uses CSS classes (health-good/warn/bad) instead of
inline Jinja colors — readable in both light and dark modes
- Stat card counts use CSS color variables for dark mode support
- Fix duplicate display:none on bulk toolbar
- input[type=date] added to themed input selector
iterminate
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