refactor(random-mix): G.88 — extract panels + dedupe track row (cluster, multi-commit) (#655)

* refactor(random-mix): G.88.1 — extract helpers + AUDIOBOOK_GENRES + filter logic

* refactor(random-mix): G.88.2 — extract RandomMixHeader component

* refactor(random-mix): G.88.3 — extract RandomMixFiltersPanel component

* refactor(random-mix): G.88.4 — extract RandomMixGenrePanel component

* refactor(random-mix): G.88.5 — extract RandomMixTrackRow (dedupe genre + main lists)

src/utils/randomMixHelpers.ts

@@ -0,0 +1,41 @@
+import type { SubsonicSong } from '../api/subsonicTypes';
+import { passesMixMinRatings, type MixMinRatingsConfig } from './mixRatingFilter';
+
+export const AUDIOBOOK_GENRES = [
+  'hörbuch', 'hoerbuch', 'hörspiel', 'hoerspiel',
+  'audiobook', 'audio book', 'spoken word', 'spokenword',
+  'podcast', 'kapitel', 'thriller', 'krimi', 'speech',
+  'fantasy', 'comedy', 'literature',
+];
+
+export function formatRandomMixDuration(seconds: number): string {
+  if (!seconds || isNaN(seconds)) return '0:00';
+  const m = Math.floor(seconds / 60);
+  const s = seconds % 60;
+  return `${m}:${s.toString().padStart(2, '0')}`;
+}
+
+interface FilterArgs {
+  excludeAudiobooks: boolean;
+  customGenreBlacklist: string[];
+  mixRatingCfg: MixMinRatingsConfig;
+}
+
+export function filterRandomMixSongs(songs: SubsonicSong[], args: FilterArgs): SubsonicSong[] {
+  const { excludeAudiobooks, customGenreBlacklist, mixRatingCfg } = args;
+  return songs.filter(song => {
+    if (!excludeAudiobooks) return true;
+    const checkText = (text: string) => {
+      const t = text.toLowerCase();
+      if (AUDIOBOOK_GENRES.some(ag => t.includes(ag))) return true;
+      if (customGenreBlacklist.some(bg => t.includes(bg.toLowerCase()))) return true;
+      return false;
+    };
+    if (song.genre && checkText(song.genre)) return false;
+    if (song.title && checkText(song.title)) return false;
+    if (song.album && checkText(song.album)) return false;
+    if (song.artist && checkText(song.artist)) return false;
+    if (!passesMixMinRatings(song, mixRatingCfg)) return false;
+    return true;
+  });
+}