Fix CDDB parser: only ' / ' splits artist/title, never ' - '

Classical titles like 'Sonate: I. Largo - Allegro' were incorrectly split
at the movement-separator dash, producing wrong artist/title pairs.
Now only ' / ' (CDDB compilation standard) is treated as artist-title
separator; ' - ' is always part of the title.

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

tests/test_ripper.py

@@ -63,31 +63,34 @@ class TestCleanInput:
 class TestParseCddbLines:
     """Tests für _parse_cddb_lines."""
 
-    def test_parse_single_track(self) -> None:
-        lines = ["1: Artist - Title"]
+    def test_parse_single_track_title_only(self) -> None:
+        """Reguläres Album: Zeile ohne ' / ' → artist leer, gesamter Inhalt = Titel."""
+        lines = ["1: Für Elise"]
         tracks = _parse_cddb_lines(lines)
         assert len(tracks) == 1
         assert tracks[0].track_number == 1
-        assert tracks[0].artist == "Artist"
-        assert tracks[0].title == "Title"
+        assert tracks[0].artist == ""
+        assert tracks[0].title == "Für Elise"
 
-    def test_parse_multiple_tracks(self) -> None:
+    def test_parse_regular_multiple_tracks(self) -> None:
+        """Mehrere reguläre Tracks werden korrekt geparst."""
         lines = [
-            "1: Artist One - Title One",
-            "2: Artist Two - Title Two",
-            "3: Artist Three - Title Three",
+            "1: First Title",
+            "2: Second Title",
+            "3: Third Title",
         ]
         tracks = _parse_cddb_lines(lines)
         assert len(tracks) == 3
         assert tracks[2].track_number == 3
-        assert tracks[2].artist == "Artist Three"
-        assert tracks[2].title == "Title Three"
+        assert tracks[2].artist == ""
+        assert tracks[2].title == "Third Title"
 
-    def test_parse_with_spaces_in_title(self) -> None:
-        lines = ["1: Wolfgang Anheisser - Wer recht in Freuden wandern will"]
+    def test_dash_in_title_not_split(self) -> None:
+        """' - ' in klassischen Titeln wird NICHT als Künstler-Separator behandelt."""
+        lines = ['1: Sonata "Tempest": I. Largo - Allegro']
         tracks = _parse_cddb_lines(lines)
-        assert tracks[0].artist == "Wolfgang Anheisser"
-        assert tracks[0].title == "Wer recht in Freuden wandern will"
+        assert tracks[0].artist == ""
+        assert tracks[0].title == 'Sonata "Tempest": I. Largo - Allegro'
 
     def test_ignores_non_matching_lines(self) -> None:
         lines = [