Replace the 📌/🔄 emoji with inline Tabler SVGs colored via --color-accent
to match the note-header icons, and reword the always-latest description so
the two options no longer share the same em-dash phrasing.
The Share button now offers two links: the pinned snapshot (default) and
an "always latest" link that carries note paths in `?liveNotes` instead of
blob shas. On open they resolve to the current shas against the HEAD file
list and the URL is rewritten to the ordinary pinned form, so freshness,
editing and the snapshot banner keep working unchanged.
