Cover Art Filler: scan falls back to the raw file path when mapping fails (Sokhi #fix)

Root cause of Sokhi's endless 0-findings: the SCAN resolved each track's path
through the path-mapping layer with NO fallback, while the APPLY
(_fix_missing_cover_art) uses `_resolve_file_path(...) or p` — i.e. it falls
back to the raw DB path when mapping returns nothing. On his Docker setup the
mapping returns None, so the scan set has_local=False and skipped every album
(never looking at the folder), even though the apply WOULD have written the
cover.jpg from the raw path.

Fix: make the scan match the apply — if mapping returns nothing but the raw DB
path is a real file (container path == stored path), use it as-is. Now the scan
actually inspects the folder, sees the missing cover.jpg, and flags it; the
apply then writes it from the embedded art.

Tests: unresolved-path-but-real-file → flagged (sidecar_from_embedded); the
fallback does NOT fire for a non-existent path (media-server-only stays skipped).
Kept the [cover-diag] logging from the prior commit to confirm on Sokhi's run.

core/repair_jobs/missing_cover_art.py

@@ -185,6 +185,14 @@ class MissingCoverArtJob(RepairJob):
                 download_folder=download_folder,
                 config_manager=context.config_manager,
             ) if rep_path else None
+            # Match the apply (_fix_missing_cover_art line ~1376: `... or p`): if
+            # the path-mapping layer returns nothing but the raw DB path is
+            # already a real file (the common Docker case where the container
+            # path == the stored path), use it as-is. Without this the scan never
+            # sees the folder and skips the album, while the apply WOULD have
+            # written the cover.jpg — the exact gap behind Sokhi's 0-findings.
+            if not resolved_rep and rep_path and os.path.isfile(rep_path):
+                resolved_rep = rep_path
             has_local = bool(resolved_rep)
             # Check embedded art and the cover.jpg sidecar SEPARATELY (not the
             # combined album_has_art_on_disk, which returns True if EITHER is

tests/test_missing_cover_art.py

@@ -390,3 +390,42 @@ def test_media_server_only_album_empty_thumb_still_flagged(monkeypatch):
 
     result = mca.MissingCoverArtJob().scan(context)
     assert result.findings_created == 1   # media-server-only + empty thumb → flagged
+
+
+def test_unresolved_path_falls_back_to_raw_when_file_exists(tmp_path, monkeypatch):
+    # Docker case (Sokhi): the path-mapping layer returns None, but the raw DB
+    # path is already a real file in the container. The scan must use it as-is —
+    # like the apply does (`_resolve_file_path(...) or p`) — so the album's
+    # folder is actually checked instead of the album being skipped.
+    track = tmp_path / 'Album' / '01.flac'
+    track.parent.mkdir()
+    track.write_bytes(b'')
+    conn = _make_db((1, 'Album', 1, 'https://has/thumb', None, None, None, None, None))
+    _add_track(conn, str(track))
+    context = _make_context(conn)
+    monkeypatch.setattr(mca, 'resolve_library_file_path', lambda raw, **k: None)  # mapping fails
+    monkeypatch.setattr(mca, 'file_has_embedded_art', lambda p: True)             # files have art
+    # real folder has no cover.jpg → should flag for the sidecar
+    monkeypatch.setattr(mca, 'get_primary_source', lambda: 'spotify')
+    monkeypatch.setattr(mca, 'get_client_for_source', lambda s: _FakeClient())    # API finds nothing
+
+    result = mca.MissingCoverArtJob().scan(context)
+
+    assert result.findings_created == 1   # raw path used → folder checked → flagged
+    assert context.findings[0]['details']['sidecar_from_embedded'] is True
+
+
+def test_unresolved_path_with_no_real_file_still_skips(tmp_path, monkeypatch):
+    # Guard: the raw-path fallback must NOT fire for a path that isn't a real
+    # file (no false "local" on a genuinely media-server-only album).
+    conn = _make_db((1, 'Album', 1, 'https://has/thumb', None, None, None, None, None))
+    _add_track(conn, '/does/not/exist/01.flac')
+    context = _make_context(conn)
+    monkeypatch.setattr(mca, 'resolve_library_file_path', lambda raw, **k: None)
+    called = []
+    monkeypatch.setattr(mca, 'file_has_embedded_art', lambda p: called.append(p) or True)
+
+    result = mca.MissingCoverArtJob().scan(context)
+
+    assert result.findings_created == 0   # no real file, db has thumb → skipped
+    assert called == []                   # never treated as local