The sidebar tree is part of the page (chain to the current page
expanded, active row marked), so it no longer paints late and the
sessionStorage snapshot is gone; only the rail's scroll position is
kept. Folders are native <details> that lazy-load their children as
HTML via htmx. The tree picker hosts the same server-rendered rows with
radio inputs, so ?tree returns HTML and the JSON listing is removed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
luxickandClaude Opus 5.5