- Drop FA4 font files and font-awesome.min.css.
- Ship FA6 webfonts (solid, regular, brands) and fa6.min.css.
- io-indicator: use FA6 names (fa-circle-plus / -minus / -exclamation).
- static/js/ui.js: no-op the legacy side-menu click handler when menu
links are not present (V09 chrome removes them) so the Settings tab
no longer logs 'cannot set properties of null'.