Four fixes from the review:
**library.js — back button stack (JohnBaumb):**
Replace the single-slot `artistDetailPageState.originPage` with an origin
stack. Chained navigation like Search → Artist A → similar Artist B →
similar Artist C now walks back one step at a time (C → B → A → Search)
instead of jumping straight to Search and skipping A and B.
`navigateToArtistDetail` takes an optional `{skipOriginPush}` flag so the
back button can re-enter a prior artist without re-pushing onto the stack.
Fresh entries from a non-artist page clear any stale stack from a prior
chain. Duplicate-click detection avoids pushing the same target twice.
Label derivation (`_updateArtistDetailBackButtonLabel`) reads the stack top
so the button says "Back to <ArtistName>" mid-chain and "Back to Search"
at the root.
**library.js — checkArtistEnhanceEligibility after library upgrade (Cin):**
The quality-analysis endpoint only works on library PKs. After the
library-upgrade branch rewrites `currentArtistId` from the source ID to
the library PK, the check was still using the original closure arg, so
upgraded source artists never hit `/api/library/artist/<id>/quality-analysis`.
Use `artistDetailPageState.currentArtistId` so the call gets the resolved id.
**init.js — isPageAllowed + home page recursion (Cin):**
- artist-detail is reachable from both Library and Search results now, so
permission check accepts either grant (plus legacy 'downloads'/'artists'
aliases). Search-only profiles can open source artists; legacy artists-only
profiles no longer recurse on the home redirect.
- `getProfileHomePage` rewrites 'artists' → 'search' (it already rewrote
'downloads') so legacy home_page values resolve correctly.
- Legacy-compat expanded in isPageAllowed to treat 'artists' as equivalent
to 'search' in both directions.
**init.js — profile edit forms dropping values on save (Cin):**
Both pageLabels maps (admin edit form + self-edit form) referenced the
legacy 'downloads'/'artists' keys. When editing a profile saved with
`home_page: 'search'` and `allowed_pages: ['search', 'library']`, the
home select didn't render a 'search' option, and the allowed_pages
checkboxes used 'downloads' as their value — so saving the form dropped
both values.
Update both maps to use 'search' as the canonical key. Add
`_normalizeLegacyAllowedPages` and `_normalizeLegacyHomePage` helpers that
migrate any legacy ids in allowed_pages/home_page on read, so a legacy
profile's first save upgrades its stored ids to the new canonical form.
b547909604
