feat(web/m7-352): kind-aware createPlaylistsQuery + system-playlists-status helper

web/src/lib/api/me.ts

@@ -0,0 +1,24 @@
+import { createQuery } from '@tanstack/svelte-query';
+import { api } from './client';
+import { qk } from './queries';
+
+export type SystemPlaylistsStatus = {
+  in_flight: boolean;
+  last_run_at: string | null;
+  last_error: string | null;
+};
+
+export async function getSystemPlaylistsStatus(): Promise<SystemPlaylistsStatus> {
+  return api.get<SystemPlaylistsStatus>('/api/me/system-playlists-status');
+}
+
+// Refresh aggressively while a build is in_flight so the building → built
+// transition appears live on the home page. Stale-time is short; manual
+// invalidations on the server's POST endpoints are out of scope.
+export function createSystemPlaylistsStatusQuery() {
+  return createQuery({
+    queryKey: qk.systemPlaylistsStatus(),
+    queryFn: getSystemPlaylistsStatus,
+    staleTime: 10_000
+  });
+}