The discovery FIX → Confirm flow 404'd with "Discovery state not found" whenever
the in-memory discovery state was gone — a server restart, or an imported
playlist that wasn't discovered in THIS process — even though the card is still
shown from persisted data (the reporter's log shows "Returning 0 stored ...
playlists for hydration", i.e. the in-memory states were empty).
The thing that actually makes a manual fix STICK is writing it to the discovery
cache (save_discovery_cache_match), keyed by the original track's name + artist —
which doesn't need the in-memory state at all. But the endpoint 404'd on the
missing state before reaching that write, so the fix was dead after a restart.
- update_discovery_match (core/discovery/endpoints.py) now only does the in-memory
result update when the state exists; the durable discovery-cache write always
runs, falling back to client-provided original_name/original_artist when there's
no in-memory state. With neither a state nor originals it still 404s (unchanged).
- The FIX confirm (wishlist-tools.js) now sends original_name/original_artist
(from the source track it already has) so the backend can key the cache.
Covers all sources that share the helper (tidal/deezer/qobuz/spotify-public).
Tests: no-state-but-originals saves the cache + returns success; no-state-no-
originals still 404s; existing with-state path unchanged. 73 discovery tests pass.
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