- Change CSS default from light to dark mode in :root selector
(System Hub common.css in both theme and app)
- Add CSS rules to hide LuCI view tabs (.cbi-tabmenu, ul.tabs, etc.)
when in SecuBox mode
- Update hideOpenWrtUI() to also hide view tabs via JavaScript
This ensures consistent dark theme styling without depending on
data-secubox-theme attribute timing, and hides LuCI's native
navigation tabs when displaying SecuBox header.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>