Sidebar redesign:
- Wide (>1180px): labels only, no icons, no border-left outline, no
background tint on active — just the label going acid green when
the section is in view. Sidebar moved down (+34px top padding) so
the first link doesn't crowd the topnav.
- Medium (720-1180px): icon rail only.
- Mobile (<720px): bottom bar with icons only.
- Background dropped from rgba(.82) to rgba(.42) — the backdrop-blur
already carries the separation, less panel-heavy against the hero.
- "On this page" section header dropped: the sidebar is close enough
to the topnav that the label reads as chrome rather than nav.
- Active state is now colour only (acid on the label); the left
border stripe and highlight background are gone.
Nav path fix (broken link on the silentmode.st mirror):
Root-absolute nav paths like /plug-ins/ resolved to
silentmode.st/plug-ins/ (404) instead of silentmode.st/theseus/plug-ins/
when a reader browsed the fallback mirror. Rewrote every topnav link,
cross-page prose link and favicon href to relative form
(plug-ins/, ../plug-ins/, assets/favicon.svg, …). Works on both the
BCNR name and the silentmode.st/theseus/ mount.
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