Group genre dropdowns into non-selectable optgroup sections

- Load grouped genre list (music_genres_grouped.txt) with section headings
- Render headings as <optgroup> labels (visible, not selectable)
- Add Disney under CHILDREN'S & HOLIDAY (was missing from grouped file)
- Bump version to 0.9.3

helpers.py

@@ -50,9 +50,9 @@ from config import Config
 # Genre / decade helpers
 # ---------------------------------------------------------------------------
 
-_GENRES_PATH = Path('/mnt/Storage/Music Genres.txt')
+_GENRES_PATH = Path('/mnt/Storage/music_genres_grouped.txt')
 _DECADES_PATH = Path('/mnt/Storage/Decades.txt')
-_FALLBACK_GENRES_PATH = Path(__file__).parent / 'lists' / 'music_genres.txt'
+_FALLBACK_GENRES_PATH = Path(__file__).parent / 'lists' / 'music_genres_grouped.txt'
 _FALLBACK_DECADES_PATH = Path(__file__).parent / 'lists' / 'decades.txt'
 
 
@@ -72,9 +72,38 @@ def _load_list(primary: Path, fallback: Path) -> list[str]:
     return _load_lines(fallback)
 
 
-MUSIC_GENRES = _load_list(_GENRES_PATH, _FALLBACK_GENRES_PATH)
+def _load_genre_groups(primary: Path, fallback: Path) -> list[dict]:
+    """Parse a grouped genre file into [{'label': str, 'genres': [str, ...]}, ...].
+
+    A blank line ends the current group; the first line after a blank line (or
+    the very first line) is the group heading, and every following line until
+    the next blank line is a genre under that heading. Headings are rendered as
+    non-selectable <optgroup> labels, so they are visible but not clickable.
+    """
+    path = primary if primary.exists() else fallback
+    if not path.exists():
+        return []
+    groups = []
+    current = None
+    for raw in path.read_text(encoding='utf-8').splitlines():
+        line = raw.strip()
+        if not line:
+            current = None
+            continue
+        if current is None:
+            current = {'label': line, 'genres': []}
+            groups.append(current)
+        else:
+            current['genres'].append(line)
+    return groups
+
+
+GENRE_GROUPS = _load_genre_groups(_GENRES_PATH, _FALLBACK_GENRES_PATH)
 DECADES = _load_list(_DECADES_PATH, _FALLBACK_DECADES_PATH)
 
+# Flat list of every genre, derived from the grouped list so the two stay in sync.
+MUSIC_GENRES = [g for group in GENRE_GROUPS for g in group['genres']]
+
 
 def parse_style_genre(style_genre: str | None) -> dict:
     """