Backend
- sort=recent stays a back-compat alias for created (parse_sort); invalid
sort/order now return the structured 422 envelope instead of plain-text 400
- per-field default direction on omitted order (dates desc, text asc), matching
the frontend so a bare ?sort=<field> reads the same in UI and API
- migration 0033: index mangas(updated_at DESC, id) backing the default sort
and its id tie-break; NULLS LAST now applied only to the nullable author key
- tests: recent alias, per-field default (title+author), invalid-value 422,
and a tie-break test that pins ordering by ascending id (mutation-verified)
Frontend
- pure sort helpers extracted to $lib/mangaSort with unit tests; coerceSort
honors the recent alias so pasted/legacy URLs resolve to the same field
- SegmentedControl: roving tabindex + arrow/Home/End keyboard nav, anchored on
focus so rapid keypresses don't stick
- UX: visible "Direction" labels (desktop + mobile), mobile sort-sheet section
headings and a "Done" button; README sort/order contract updated
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>