feat(genre): support multi-select genre filter

- Allow multiple genre selection (checkbox behavior)
- Add getSelectedGenreNames() for multiple name retrieval
- Merge results from multiple API calls for featured albums
- Clear button now closes the popup
- Button shows "N genres" when multiple selected

src/lib/components/GenreFilterButton.svelte

@@ -6,6 +6,7 @@
     hasActiveFilter,
     getAvailableGenres,
     getSelectedGenreIds,
+    getSelectedGenreNames,
     loadGenres,
     subscribe as subscribeGenre,
     type GenreInfo
@@ -46,12 +47,11 @@
   });
 
   function updateSelectedName() {
-    const selectedIds = getSelectedGenreIds();
-    if (selectedIds.size === 1) {
-      const genres = getAvailableGenres();
-      const selectedId = Array.from(selectedIds)[0];
-      const genre = genres.find(g => g.id === selectedId);
-      selectedGenreName = genre?.name ?? null;
+    const selectedNames = getSelectedGenreNames();
+    if (selectedNames.length === 1) {
+      selectedGenreName = selectedNames[0];
+    } else if (selectedNames.length > 1) {
+      selectedGenreName = `${selectedNames.length} genres`;
     } else {
       selectedGenreName = null;
     }

src/lib/components/GenreFilterPopup.svelte

@@ -81,6 +81,7 @@
 
   function handleClearAll() {
     clearSelection();
+    onClose();
   }
 
   function handleRememberToggle() {

src/lib/components/views/HomeView.svelte

@@ -18,7 +18,8 @@
   } from '$lib/stores/homeSettingsStore';
   import {
     getSelectedGenreId,
-    getSelectedGenreName,
+    getSelectedGenreIds,
+    getSelectedGenreNames,
     hasActiveFilter as hasGenreFilter
   } from '$lib/stores/genreFilterStore';
   import { setPlaybackContext } from '$lib/stores/playbackContextStore';
@@ -323,7 +324,7 @@
     total: number;
   }
 
-  async function fetchFeaturedAlbums(featuredType: string, limit: number, genreId?: number): Promise<AlbumCardData[]> {
+  async function fetchFeaturedAlbumsSingle(featuredType: string, limit: number, genreId?: number): Promise<AlbumCardData[]> {
     try {
       const response = await invoke<FeaturedAlbumsResponse>('get_featured_albums', {
         featuredType,
@@ -337,6 +338,33 @@
     }
   }
 
+  async function fetchFeaturedAlbums(featuredType: string, limit: number, genreIds: number[]): Promise<AlbumCardData[]> {
+    if (genreIds.length === 0) {
+      // No filter, fetch without genre
+      return fetchFeaturedAlbumsSingle(featuredType, limit);
+    }
+    if (genreIds.length === 1) {
+      // Single genre, use API filter
+      return fetchFeaturedAlbumsSingle(featuredType, limit, genreIds[0]);
+    }
+    // Multiple genres: fetch each and merge (dedupe by album id)
+    const perGenreLimit = Math.ceil(limit / genreIds.length) + 2;
+    const results = await Promise.all(
+      genreIds.map(gid => fetchFeaturedAlbumsSingle(featuredType, perGenreLimit, gid))
+    );
+    const seen = new Set<string>();
+    const merged: AlbumCardData[] = [];
+    for (const albums of results) {
+      for (const album of albums) {
+        if (!seen.has(album.id)) {
+          seen.add(album.id);
+          merged.push(album);
+        }
+      }
+    }
+    return merged.slice(0, limit);
+  }
+
   function toAlbumCard(album: QobuzAlbum): AlbumCardData {
     return {
       id: album.id,
@@ -447,11 +475,13 @@
   }
 
   function filterAlbumsByGenre(albums: AlbumCardData[]): AlbumCardData[] {
-    const selectedGenreName = getSelectedGenreName();
-    if (!selectedGenreName) return albums;
-    // Filter albums whose genre contains the selected genre name (case-insensitive)
+    const selectedGenreNames = getSelectedGenreNames();
+    if (selectedGenreNames.length === 0) return albums;
+    // Filter albums whose genre matches any of the selected genres (case-insensitive)
     return albums.filter(album =>
-      album.genre.toLowerCase().includes(selectedGenreName.toLowerCase())
+      selectedGenreNames.some(genreName =>
+        album.genre.toLowerCase().includes(genreName.toLowerCase())
+      )
     );
   }
 
@@ -490,12 +520,12 @@
       limitFavorites: Math.max(homeLimits.favoriteAlbums, homeLimits.favoriteTracks)
     });
 
-    // Get current genre filter
-    const genreId = getSelectedGenreId();
+    // Get current genre filter (array of IDs for multi-select)
+    const genreIds = Array.from(getSelectedGenreIds());
 
     // Start Qobuz API calls in parallel (don't await)
     if (isSectionVisible('newReleases')) {
-      fetchFeaturedAlbums('new-releases', homeLimits.featuredAlbums, genreId).then(async albums => {
+      fetchFeaturedAlbums('new-releases', homeLimits.featuredAlbums, genreIds).then(async albums => {
         newReleases = albums;
         await loadAllAlbumDownloadStatuses(albums);
         loadingNewReleases = false;
@@ -506,7 +536,7 @@
     }
 
     if (isSectionVisible('pressAwards')) {
-      fetchFeaturedAlbums('press-awards', homeLimits.featuredAlbums, genreId).then(async albums => {
+      fetchFeaturedAlbums('press-awards', homeLimits.featuredAlbums, genreIds).then(async albums => {
         pressAwards = albums;
         await loadAllAlbumDownloadStatuses(albums);
         loadingPressAwards = false;
@@ -517,7 +547,7 @@
     }
 
     if (isSectionVisible('mostStreamed')) {
-      fetchFeaturedAlbums('most-streamed', homeLimits.featuredAlbums, genreId).then(async albums => {
+      fetchFeaturedAlbums('most-streamed', homeLimits.featuredAlbums, genreIds).then(async albums => {
         mostStreamed = albums;
         await loadAllAlbumDownloadStatuses(albums);
         loadingMostStreamed = false;
@@ -528,7 +558,7 @@
     }
 
     if (isSectionVisible('qobuzissimes')) {
-      fetchFeaturedAlbums('qobuzissimes', homeLimits.featuredAlbums, genreId).then(async albums => {
+      fetchFeaturedAlbums('qobuzissimes', homeLimits.featuredAlbums, genreIds).then(async albums => {
         qobuzissimes = albums;
         await loadAllAlbumDownloadStatuses(albums);
         loadingQobuzissimes = false;
@@ -539,7 +569,7 @@
     }
 
     if (isSectionVisible('editorPicks')) {
-      fetchFeaturedAlbums('editor-picks', homeLimits.featuredAlbums, genreId).then(async albums => {
+      fetchFeaturedAlbums('editor-picks', homeLimits.featuredAlbums, genreIds).then(async albums => {
         editorPicks = albums;
         await loadAllAlbumDownloadStatuses(albums);
         loadingEditorPicks = false;

src/lib/stores/genreFilterStore.ts

@@ -116,6 +116,13 @@ export function getSelectedGenreName(): string | undefined {
   return genre?.name;
 }
 
+export function getSelectedGenreNames(): string[] {
+  const ids = Array.from(state.selectedGenreIds);
+  return ids
+    .map(id => state.availableGenres.find(g => g.id === id)?.name)
+    .filter((name): name is string => !!name);
+}
+
 export function isGenreSelected(genreId: number): boolean {
   return state.selectedGenreIds.has(genreId);
 }
@@ -128,8 +135,6 @@ export function toggleGenre(genreId: number): void {
   if (state.selectedGenreIds.has(genreId)) {
     state.selectedGenreIds.delete(genreId);
   } else {
-    // For now, only allow single selection (API limitation)
-    state.selectedGenreIds.clear();
     state.selectedGenreIds.add(genreId);
   }
   saveToStorage();