fix(library): multi-genre local index with track_genre and backfill (#1059)

* fix(library): multi-genre local index with track_genre and backfill

Restore atomic genre browse, filters, and counts via track_genre:
OpenSubsonic genres[] first with Navidrome-default split fallback, sync
write path, read-path query switches, blocking startup backfill with
progress, and v12 repair migration for DBs that recorded legacy 002–011.
TS fallback adds genreTagsFor and migration gate i18n across locales.

* fix(library): address multi-genre review — robust TS genres and scope join

genreTagsFor routes raw genres through parseItemGenres (single-object
Subsonic quirk and bare strings). Library-scoped genre browse/counts join
track for raw_json library_id fallback. Statistics keeps empty-genre bucket.

* docs: CHANGELOG and credits for multi-genre local index (PR #1059)

* docs(changelog): credit HiveMind on Discord for multi-genre report (PR #1059)

src/store/migrationStore.ts

@@ -1,30 +1,49 @@
 import { create } from 'zustand';
+import type { GenreTagsInspectDto } from '../api/library';
 import type { MigrationInspectReport, MigrationProgressEvent } from '../api/migration';
 
 export type MigrationPhase = 'idle' | 'inspecting' | 'running' | 'completed' | 'error';
+export type MigrationStep = 'serverIndex' | 'genreTags';
+
+export interface GenreTagsProgressEvent {
+  done: number;
+  total: number;
+}
 
 interface MigrationState {
   phase: MigrationPhase;
+  step: MigrationStep | null;
   needsMigration: boolean;
   inspect: MigrationInspectReport | null;
   progress: MigrationProgressEvent | null;
+  genreTagsInspect: GenreTagsInspectDto | null;
+  genreTagsProgress: GenreTagsProgressEvent | null;
   lastError: string | null;
   setPhase: (phase: MigrationPhase) => void;
+  setStep: (step: MigrationStep | null) => void;
   setNeedsMigration: (needsMigration: boolean) => void;
   setInspect: (report: MigrationInspectReport | null) => void;
   setProgress: (event: MigrationProgressEvent | null) => void;
+  setGenreTagsInspect: (report: GenreTagsInspectDto | null) => void;
+  setGenreTagsProgress: (event: GenreTagsProgressEvent | null) => void;
   setError: (error: string | null) => void;
 }
 
 export const useMigrationStore = create<MigrationState>(set => ({
   phase: 'idle',
+  step: null,
   needsMigration: false,
   inspect: null,
   progress: null,
+  genreTagsInspect: null,
+  genreTagsProgress: null,
   lastError: null,
   setPhase: phase => set({ phase }),
+  setStep: step => set({ step }),
   setNeedsMigration: needsMigration => set({ needsMigration }),
   setInspect: inspect => set({ inspect }),
   setProgress: progress => set({ progress }),
+  setGenreTagsInspect: genreTagsInspect => set({ genreTagsInspect }),
+  setGenreTagsProgress: genreTagsProgress => set({ genreTagsProgress }),
   setError: lastError => set({ lastError }),
 }));