Replace the full-width top bar with a fixed floating header of glass pills: a
fixed-position ModuleName (accent dot + label + prev/next cyclic module stepper)
and a shared SearchBar. The header's left edge is anchored as if the nav rail
and filter sidebar were both open, so it never shifts on collapse or module
change; the right edge leaves a 10% margin.
- ModuleName label width is measured live from the reachable modules' titles in
the current language, recomputing on a language or account change.
- Module names come from a shared moduleLabelKey (the same short labels as the
nav rail); NavSidebar and the header now read from one source (lib/modules.ts).
- The arrows step cyclically through moduleOrder(me) — dynamic, no hard-coded
targets, wrapping at both ends.
- Search is hoisted into the SearchBar for feed (YouTube search), plex, channels
(including the Discovery tab) and playlists (new); Go button, Enter triggers it.
- The Playlists left rail now reaches the top; header clearance via --hdr-h.
