feat(web): add home/albums/artists API clients for M6a

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

web/src/lib/api/home.ts

@@ -0,0 +1,19 @@
+import { createQuery } from '@tanstack/svelte-query';
+import { api } from './client';
+import { qk } from './queries';
+import type { HomePayload } from './types';
+
+export async function listHome(): Promise<HomePayload> {
+  return api.get<HomePayload>('/api/home');
+}
+
+// staleTime = 60s — repeat home-page mounts within a minute reuse cached
+// data. Like-state changes, new plays, freshly-added albums surface on
+// the next refetch.
+export function createHomeQuery() {
+  return createQuery({
+    queryKey: qk.home(),
+    queryFn: listHome,
+    staleTime: 60_000
+  });
+}