port over astra desktop tag algos

src/stores/settingsStore.ts

@@ -0,0 +1,41 @@
+import { create } from 'zustand';
+import { openLibraryDb } from '@/db/database';
+import { getSetting, setSetting } from '@/db/queries';
+import type { ArtistGroupingMode } from '@/library/artistGrouping';
+
+/**
+ * Persisted app preferences. SQLite (settings table) is the source of truth — this
+ * store mirrors it in memory. Kept free of cross-store imports; libraryStore
+ * subscribes here to recompute the artist list when the grouping mode changes.
+ */
+const ARTIST_GROUPING_KEY = 'artist_grouping_mode';
+
+function parseGroupingMode(value: string | null): ArtistGroupingMode {
+  return value === 'fileTags' ? 'fileTags' : 'astra';
+}
+
+interface SettingsStore {
+  artistGroupingMode: ArtistGroupingMode;
+  loaded: boolean;
+  load: () => Promise<void>;
+  setArtistGroupingMode: (mode: ArtistGroupingMode) => Promise<void>;
+}
+
+export const useSettingsStore = create<SettingsStore>((set, get) => ({
+  artistGroupingMode: 'astra',
+  loaded: false,
+
+  load: async () => {
+    if (get().loaded) return;
+    const db = await openLibraryDb();
+    const stored = await getSetting(db, ARTIST_GROUPING_KEY);
+    set({ artistGroupingMode: parseGroupingMode(stored), loaded: true });
+  },
+
+  setArtistGroupingMode: async (mode) => {
+    if (get().artistGroupingMode === mode) return;
+    set({ artistGroupingMode: mode });
+    const db = await openLibraryDb();
+    await setSetting(db, ARTIST_GROUPING_KEY, mode);
+  },
+}));