fix(music): stop reading a kb/s bitrate as a hi-res sample rate

A lossy label such as "256 kb/s AAC" or "MP3 320 kb/s" no longer gets the per-track Hi-Res badge.

tests/core/test_music_renderer.py

@@ -0,0 +1,22 @@
+import pytest
+
+from unshackle.core.music.renderer import MusicRenderer
+
+
+@pytest.mark.parametrize(
+    ("label", "hires"),
+    [
+        ("FLAC 24-bit/96kHz", True),
+        ("24-bit / 96 kHz", True),
+        ("FLAC 16-bit/88.2kHz", True),
+        ("96k", True),
+        ("FLAC 16-bit/44.1kHz", False),
+        ("Lossless", False),
+        ("256 kb/s AAC", False),
+        ("MP3 320 kb/s", False),
+        ("320kbps", False),
+        ("AAC 96 kbit/s", False),
+    ],
+)
+def test_is_hires_quality_reads_sample_rate_not_bitrate(label: str, hires: bool) -> None:
+    assert MusicRenderer.is_hires_quality(label) is hires

unshackle/core/music/renderer.py

@@ -285,6 +285,7 @@ class MusicRenderer:
 
     @staticmethod
     def is_hires_quality(value: str) -> bool:
+        """Return True for a label above 16-bit or 48 kHz; a "k" before "b" is a bitrate ("256 kb/s"), not a rate."""
         lowered = value.lower()
         bit_depth = None
         sample_rate = None
@@ -293,7 +294,7 @@ class MusicRenderer:
         if bit_match:
             bit_depth = int(bit_match.group("bits"))
 
-        sample_match = re.search(r"(?P<rate>\d+(?:\.\d+)?)\s*k(?:hz)?", lowered)
+        sample_match = re.search(r"(?P<rate>\d+(?:\.\d+)?)\s*k(?!b)(?:hz)?", lowered)
         if sample_match:
             sample_rate = float(sample_match.group("rate"))