Posts, Artists, and Tags are the three 'browse the library by an axis'
surfaces; Subscriptions stays purely management (operator-asked 2026-06-09).
New BrowseView renders them as tabs (?tab=posts|artists|tags); only the active
tab mounts. The old standalone paths become redirects into the matching tab,
preserving deep-link query (/posts?post_id=N → /browse?tab=posts&post_id=N) and
keeping the route names so existing { name: 'posts'|'artists'|'tags' } links and
path pushes still resolve. Nav now reads Showcase · Gallery · Browse · Series ·
Subscriptions, with Settings pinned right.
Test: /browse resolves; /tags and /artists redirect into their tabs; a posts
deep link survives the redirect.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen