test(web): update home placeholder counts for new Discover slot

5-slot system row (For-You, Discover, 3× Songs-like) means:
- empty state: 5 placeholders (was 4)
- For-You only: 4 placeholders (was 3) — Discover + 3 songs-like

web/src/routes/page.test.ts

@@ -54,10 +54,11 @@ beforeEach(() => {
 afterEach(() => vi.clearAllMocks());
 
 describe('home Playlists section', () => {
-  test('renders 4 placeholder cards when no playlists exist', () => {
+  test('renders 5 placeholder cards when no playlists exist', () => {
+    // Slot layout: For-You, Discover, 3× Songs-like.
     render(Page);
     const placeholders = screen.queryAllByTestId('playlist-placeholder-card');
-    expect(placeholders).toHaveLength(4);
+    expect(placeholders).toHaveLength(5);
   });
 
   test('building status sets variant=building on placeholders', () => {
@@ -103,6 +104,8 @@ describe('home Playlists section', () => {
     render(Page);
     expect(screen.getByText('For You')).toBeInTheDocument();
     const placeholders = screen.queryAllByTestId('playlist-placeholder-card');
-    expect(placeholders).toHaveLength(3); // 3 songs-like slots
+    // 1 Discover + 3 Songs-like slots = 4 placeholders alongside the
+    // real For-You tile.
+    expect(placeholders).toHaveLength(4);
   });
 });