Add style/genre data: 105 main genres, 939 total styles with loader

- main_style.txt: curated top-level genres (pop, rock, jazz, etc.)
- all_style.txt: full style list (~939 entries)
- genres.ts: parses txt files, exports MAIN_STYLES, ALL_STYLES, SUB_STYLES

data/genres.ts

@@ -0,0 +1,31 @@
+// Import style text files
+import mainStyleText from './main_style.txt?raw';
+import allStyleText from './all_style.txt?raw';
+
+// Main styles (top-level genres) from main_style.txt
+export const MAIN_STYLES = mainStyleText
+  .split('\n')
+  .map(line => line.trim())
+  .filter(line => line.length > 0);
+
+// All styles from all_style.txt
+export const ALL_STYLES = allStyleText
+  .split('\n')
+  .map(line => line.trim())
+  .filter(line => line.length > 0);
+
+// Backward-compatible alias
+export const GENRE_KEYS = MAIN_STYLES;
+
+// Sub-styles: all styles minus the main genres
+const mainStylesLower = new Set(MAIN_STYLES.map(s => s.toLowerCase().trim()));
+
+export const SUB_STYLES = ALL_STYLES.filter(style => {
+  const styleLower = style.toLowerCase().trim();
+  return !mainStylesLower.has(styleLower);
+});
+
+// Type definitions
+export type MainStyle = typeof MAIN_STYLES[number];
+export type AllStyle = typeof ALL_STYLES[number];
+export type SubStyle = typeof SUB_STYLES[number];