The Deezer ARL field round-trips a redaction sentinel for a saved-but-untouched
secret (shown as dots). The save path already guards against the sentinel
overwriting the real token (ConfigManager.set), so the ARL was never actually
lost — but the connection TEST read the field value and sent the sentinel as the
token, so Deezer returned USER_ID=0 ('Invalid ARL token') after navigating away
and back. That false failure made it look like the ARL kept resetting.
Fix:
- ConfigManager.resolve_secret(key, posted): empty/sentinel posted value -> the
stored value; a real string -> a genuine new secret. Reusable for any secret
connection-test (single source of truth).
- /api/deezer-download/test now resolves the effective ARL via resolve_secret, so
an untouched field tests the stored token.
- testDeezerDownloadConnection() strips the sentinel before sending (untouched ->
empty -> backend uses the saved token).
Seam/regression tests for resolve_secret (sentinel/empty/none -> stored, real ->
passthrough, nothing stored -> empty). JS integrity 64 green.
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