An invalid API key (and rate limits / missing chromaprint / fingerprint
failures) all collapsed into the same None as a genuine no-match, so:
- every download showed a benign 'AcoustID: Skipped', and
- the 'Test API key' button reported a dead key as VALID
because test_api_key trusted 'no exception = valid' but fingerprint_and_lookup
swallows the error and returns None. A broken AcoustID setup looked completely
normal — which cost a real debugging session to untangle.
- New AcoustIDClient.lookup_with_status() returns a structured result that
distinguishes ok / no_match / error / no_backend / fingerprint_error /
unavailable. fingerprint_and_lookup() stays dict-or-None (library scanner /
auto-import / their tests unchanged) as a thin wrapper over it.
- verify_audio_file() uses it: a real error -> new VerificationResult.ERROR
(-> _acoustid_result='error' -> the existing red 'Error' history badge),
a genuine no-match -> SKIP 'No match in AcoustID database'. ERROR never
quarantines (an outage/bad key must not punish good files).
- test_api_key() now validates via the authoritative direct API call (error
code 4 = invalid key) instead of the swallowed-exception path.
Tests: structured-status distinction, legacy-wrapper contract, verify ERROR vs
SKIP, and test_api_key invalid-vs-accepted. Existing verify tests updated to
stub lookup_with_status (a stub returning just recordings is inferred as ok).
