feat(web): add /library/albums wrapping-grid page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/routes/library/albums/+page.svelte

@@ -0,0 +1,55 @@
+<script lang="ts">
+  import { createAlbumsAlphaInfiniteQuery } from '$lib/api/albums';
+  import AlbumCard from '$lib/components/AlbumCard.svelte';
+  import AlphabeticalGrid from '$lib/components/AlphabeticalGrid.svelte';
+  import ApiErrorBanner from '$lib/components/ApiErrorBanner.svelte';
+  import { useDelayed } from '$lib/utils/useDelayed.svelte';
+  import type { AlbumRef } from '$lib/api/types';
+
+  const queryStore = createAlbumsAlphaInfiniteQuery();
+  const query = $derived($queryStore);
+  const albums = $derived(query.data?.pages?.flatMap((p) => p.items) ?? []);
+  const total = $derived(query.data?.pages?.[0]?.total ?? 0);
+  const showSkeleton = useDelayed(() => query.isPending);
+</script>
+
+<div class="space-y-4">
+  <header>
+    <h1 class="font-display text-2xl font-medium text-text-primary">Albums</h1>
+    {#if !query.isPending && !query.isError}
+      <p class="text-sm text-text-secondary">
+        {total} {total === 1 ? 'album' : 'albums'}
+      </p>
+    {/if}
+  </header>
+
+  {#if query.isError}
+    <ApiErrorBanner error={query.error} onRetry={query.refetch} />
+  {:else if showSkeleton.value && albums.length === 0}
+    <p class="text-text-secondary">Loading…</p>
+  {:else if !query.isPending && total === 0}
+    <p class="text-text-secondary">No albums yet — scan a library folder via the server's config.</p>
+  {:else}
+    <AlphabeticalGrid
+      items={albums}
+      getKey={(a: AlbumRef) => a.sort_title || a.title}
+    >
+      {#snippet item(album: AlbumRef)}
+        <AlbumCard {album} />
+      {/snippet}
+    </AlphabeticalGrid>
+
+    {#if query.hasNextPage}
+      <button
+        type="button"
+        class="w-full rounded bg-surface py-2 text-sm hover:bg-surface-hover disabled:opacity-60"
+        disabled={query.isFetchingNextPage}
+        onclick={() => query.fetchNextPage()}
+      >
+        {query.isFetchingNextPage ? 'Loading…' : 'Load more'}
+      </button>
+    {:else if albums.length > 0}
+      <p class="py-2 text-center text-sm text-text-secondary">End of library</p>
+    {/if}
+  {/if}
+</div>

web/src/routes/library/albums/page.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, test, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import { readable } from 'svelte/store';
+
+vi.mock('$lib/api/albums', () => ({
+  createAlbumsAlphaInfiniteQuery: () => readable({
+    data: { pages: [{
+      items: [
+        { id: 'a1', title: 'Apple',  sort_title: 'Apple',
+          artist_id: 'art-1', artist_name: 'X',
+          track_count: 5, duration_sec: 100, cover_url: '/api/albums/a1/cover' },
+        { id: 'b1', title: 'Banana', sort_title: 'Banana',
+          artist_id: 'art-1', artist_name: 'X',
+          track_count: 3, duration_sec: 50,  cover_url: '/api/albums/b1/cover' }
+      ],
+      total: 2, limit: 50, offset: 0
+    }] },
+    isPending: false,
+    isError: false,
+    hasNextPage: false,
+    isFetchingNextPage: false,
+    refetch: () => {},
+    fetchNextPage: () => {}
+  }),
+  ALBUM_PAGE_SIZE: 50
+}));
+vi.mock('$lib/api/client', () => ({ api: { get: vi.fn() } }));
+vi.mock('$lib/player/store.svelte', () => ({
+  enqueueTracks: vi.fn(),
+  playQueue: vi.fn()
+}));
+vi.mock('$lib/api/likes', () => ({
+  createLikedIdsQuery: () => readable({
+    data: { track_ids: [], album_ids: [], artist_ids: [] },
+    isPending: false, isError: false
+  }),
+  likeEntity: vi.fn(),
+  unlikeEntity: vi.fn()
+}));
+
+import Page from './+page.svelte';
+
+describe('/library/albums', () => {
+  test('renders title + count + alphabetical dividers', () => {
+    render(Page);
+    expect(screen.getByRole('heading', { name: /albums/i })).toBeInTheDocument();
+    expect(screen.getByText(/2 albums/)).toBeInTheDocument();
+    expect(screen.getByText('A')).toBeInTheDocument();
+    expect(screen.getByText('B')).toBeInTheDocument();
+    expect(screen.getByText('Apple')).toBeInTheDocument();
+    expect(screen.getByText('Banana')).toBeInTheDocument();
+  });
+});