Replace the Artists route fallback content with a searchable artist list, counts, artwork, and artist-specific playback.

Hop-State: A_06FNPER3B0F42JETD868VDG
Hop-Proposal: R_06FNPEQ1X5JW4SKNSA3856G
Hop-Task: T_06FNPDXDVREH0RSVM1731Q0
Hop-Attempt: AT_06FNPDXDVS3KPW8HKJPGAA8

src/lib/artists.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import type { Track } from "../types";
+import { buildArtistSummaries } from "./artists";
+
+const track = (id: string, artist: string, albumId: string): Track => ({
+  id,
+  title: id,
+  artist,
+  album: albumId,
+  albumId,
+  duration: 180,
+  coverTone: "dusk",
+});
+
+describe("buildArtistSummaries", () => {
+  it("groups artists case-insensitively and counts their albums and tracks", () => {
+    const artists = buildArtistSummaries([
+      track("song-1", "North Window", "album-1"),
+      track("song-2", "north window", "album-1"),
+      track("song-3", "North Window", "album-2"),
+      track("song-4", "Mara Venn", "album-3"),
+    ]);
+
+    expect(artists.map((artist) => artist.name)).toEqual(["Mara Venn", "North Window"]);
+    expect(artists[1]).toMatchObject({ albumCount: 2 });
+    expect(artists[1].tracks).toHaveLength(3);
+  });
+});