Formatting was configured but never enforced: `bun run format:check`
reported 199 unformatted files and ran in no workflow and in no git hook,
so .prettierrc (printWidth 100, trailing commas) described an intention
rather than the tree.
This is the one-time sweep that makes the check gateable. Whitespace and
token-reflow only -- no behavioural change: `bun run check` reports 0
errors and all 1053 frontend tests pass before and after.
Kept out of every other commit on purpose. A 199-file diff mixed with
real changes is unreviewable, and the next commit turns format:check
into a hard CI gate so this cannot silently accumulate again.
Opening a series dumped the viewer at the top of season 1, and its Play
button played nothing at all: it resolved `$libraryItems[0]` — the first
*season* by SortName — and navigated to `/player/<seasonId>`, which the
player route bounced straight back to `/library/<seasonId>`.
The backend could already answer "where is this viewer in this show":
`repository_get_next_up_episodes` has accepted a `series_id` since it was
written and no caller had ever passed one.
Backend (DR-101, DR-106)
- `repository/series_progress.rs`: `pick_current_episode` — in progress,
else Next Up, else first unwatched, else the premiere. The third rung is
the offline path, where Next Up is always empty. `sort_series_order` puts
specials (season 0) after the numbered seasons.
- `repository_get_series_episodes` takes over the season fan-out and the
flat-series fallback, which were domain knowledge living in the frontend.
- `clear_watch_history` maps to Jellyfin's mark-unplayed (recursive over a
container, also zeroes resume). Offline it refuses rather than diverging
state the next sync would undo.
Frontend (DR-102, DR-103, DR-104, DR-107)
- Seasons collapse; only the current one is expanded, and the current
episode is badged and scrolled into view.
- Hero button reads `Resume S2E4` / `Play S1E1` and opens that episode's
focus view, where Play commits (ux-flows §5B.5).
- Seasons are no longer a destination: `/library/<seasonId>` redirects to
`/library/<seriesId>#season-N`, and every inbound link follows.
- The "More Episodes" strip spans the whole series, so a season finale
offers the next premiere instead of dead-ending (§5B.2).
- Clear-history buttons on the series hero and each season header.
Routes (DR-105)
- `/library/tv` and `/library/movies` absorb their all-titles and genres
pages as `?view=` tabs; the four legacy routes redirect. 6 video routes
become 2, and `/library/shows/genres` stops being the odd one out.
Logic extracted to `seriesNavigation.ts`, `episodeStrip.ts` and
`libraryView.ts` so it is unit-tested rather than buried in components.
Spec: docs/specs/series-current-episode-navigation.md
dtourolle