Fix crash on vinyl track positions like 'A1', 'B2' from MusicBrainz

MusicBrainz returns vinyl track numbers as 'A1', 'B3' etc. instead of
plain integers. int('A1') raised ValueError crashing the entire album.

metadata_resolver.py: parse vinyl positions with regex before int():
- 'A1' → track 1, disc 1 (side A)
- 'B3' → track 3, disc 1 (side B)
- 'C1' → track 1, disc 2 (side C)
- Non-vinyl: extract first digit group via re.search

hint_extractor.py: guard int(tl_track) in tracklist matching with
try/except + re.search so any non-numeric track position is skipped
gracefully instead of crashing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hint_extractor.py

@@ -578,8 +578,12 @@ def extract_hints(scan: AlbumScan, use_ocr: bool = True) -> AlbumHints:
                 assumed_disc = disc_num if disc_num else 1
                 for tl_entry in parsed_tracklist:
                     tl_track = tl_entry.get("track")
-                    tl_disc = int(tl_entry.get("disc", "1"))
-                    if (tl_track and int(tl_track) == track_num
+                    try:
+                        tl_disc = int(tl_entry.get("disc", "1"))
+                        tl_track_int = int(re.search(r"\d+", str(tl_track)).group()) if tl_track else None
+                    except (ValueError, AttributeError):
+                        continue
+                    if (tl_track_int is not None and tl_track_int == track_num
                             and tl_disc == assumed_disc):
                         matched_tl = tl_entry
                         break

metadata_resolver.py

@@ -549,9 +549,20 @@ def resolve(
             for medium in full_release.get("medium-list", []):
                 disc_num = medium.get("position", 1)
                 for track in medium.get("track-list", []):
+                    raw_num = str(track.get("number", "0") or "0").strip()
+                    # Vinyl: "A1"→track 1 disc 1, "B3"→track 3 disc 1, "C1"→disc 2, "D1"→disc 2
+                    vinyl_match = re.match(r"^([A-Za-z])(\d+)$", raw_num)
+                    if vinyl_match:
+                        side_letter = vinyl_match.group(1).upper()
+                        track_number = int(vinyl_match.group(2))
+                        # A,B → disc 1; C,D → disc 2; E,F → disc 3 …
+                        disc_num = (ord(side_letter) - ord("A")) // 2 + 1
+                    else:
+                        num_match = re.search(r"\d+", raw_num)
+                        track_number = int(num_match.group()) if num_match else 0
                     mb_tracks.append({
                         "disc": disc_num,
-                        "number": int(track.get("number", 0) or 0),
+                        "number": track_number,
                         "title": track.get("recording", {}).get("title", ""),
                         "artist": track.get("artist-credit-phrase", ""),
                         "mbid": track.get("recording", {}).get("id"),