Follow-up to the controller migration commits. Closes out the
extension list the per-section migrations surfaced as needed.
CONTROLLER EXTENSIONS
- Callable `fetchUrl: () => string` — resolves the seasonal-playlist
recreate-on-key-change hack from the prior commit.
- No-fetch `data:` mode — value or `() => value`. Lets render-only
sections like Seasonal Albums use the controller without inventing
a fake endpoint. Mutually exclusive with `fetchUrl`; validated up
front so misuse fails at register-time.
- `beforeLoad(ctx)` hook — runs before the spinner shows. Lets
dynamically-inserted sections like Because You Listen To ensure
their `contentEl` exists before the visibility check.
- `onSuccess(data, ctx)` hook — runs after the success gate but
before isEmpty / isStale. Cleaner home for sibling header /
subtitle / button updates than folding them into renderItems.
- `isStale(items, data)` + `onStale(ctx)` + `renderStale(items, data)`
+ `staleMessage` — third render state for "data is empty BUT
upstream is still discovering". Stale wins over empty when both
apply. Default stale UI is the same spinner block used elsewhere.
- `showErrorToast: true` config — opens a global `showToast(...)` in
addition to the in-section error block. Default off; sections that
have no recovery action shouldn't shout at the user.
- `renderItems` returning null/undefined now leaves contentEl
untouched. Lets a renderer do its own DOM manipulation (e.g.
delegating to an existing grid-render fn that targets a child
element) without fighting the controller's innerHTML swap.
MIGRATED THE 2 SKIPPED SECTIONS
- `loadYourAlbums` — uses `isStale`/`onStale`/`renderStale` for the
stale-fetch state, `onSuccess` for the subtitle/filters/download
side-effects, `hideWhenEmpty` + `sectionEl` for the truly-empty
case, `renderItems` returning null since it delegates to the
existing `_renderYourAlbumsGrid` + `_renderYourAlbumsPagination`.
- `loadSeasonalAlbums` — uses no-fetch `data:` mode because the
parent `loadSeasonalContent` already fetched the season payload.
`beforeLoad` updates the sibling title/subtitle text.
ERROR TOASTS ON ALL MIGRATED SECTIONS
Every migrated section now has `showErrorToast: true`. Section load
failures surface a global toast instead of silently spinning forever
or swallowing into console.debug. Same pattern JohnBaumb #369 asked
for at the Python layer, applied at the UI layer.
SHARED SYNC-STATUS BLOCK
Lifted the duplicated decade-tab + genre-tab sync-status HTML
(✓ completed | ⏳ pending | ✗ failed | percentage) into a single
`_renderSyncStatusBlock(idPrefix)` helper. Two call sites now share
one implementation. ListenBrainz playlists keep their own block
because the semantics differ — matching progress (total / matched /
failed) vs download progress.
DEAD-SECTION AUDIT — NONE DEAD
Audited the 13 supposedly-dead hidden sections from
DISCOVER_REVIEW.md. All 13 are alive: gated on user data (discovery
pool, library content, metadata cache) and self-surface when their
data exists via `style.display = 'block'` on the success path. The
review's grep missed the toggle. No deletions made.
DAILY MIXES ORPHAN CALL
Removed the orphaned `loadPersonalizedDailyMixes()` call from
`blockDiscoveryArtist` — Daily Mixes is intentionally paused (its
load call in `loadDiscoverPage` is commented out) so refreshing it
from the post-block hook was a no-op.
2204/2204 full suite green. JS parses clean (`node --check`).
dc2323cde6