fix: restore complete admin feature dependencies

src/lib/client-cache/song-picker-cache.ts

@@ -0,0 +1,45 @@
+/**
+ * Module-level cache for the song picker options, shared between the
+ * catalog-items table (where the picker lives) and the Sounds admin page
+ * (which invalidates after an upload/edit/delete).
+ *
+ * Living in `src/lib/` (outside any `[dynamic]` route folder) avoids
+ * cross-route client imports that confused Turbopack's HMR boundaries
+ * and triggered `Router action dispatched before initialization` on
+ * the Sounds page in dev.
+ */
+
+export interface SoundtrackOption {
+  id: number
+  code: string
+  name: string
+  author: string
+  length: number
+}
+
+let cachedOptions: SoundtrackOption[] | null = null
+let inflight: Promise<SoundtrackOption[]> | null = null
+
+export async function loadSongPickerOptions(): Promise<SoundtrackOption[]> {
+  if (cachedOptions) return cachedOptions
+  if (inflight) return inflight
+  inflight = (async () => {
+    const res = await fetch('/api/admin/sounds', { cache: 'no-store' })
+    if (!res.ok) throw new Error('Failed to load soundtracks')
+    const json = (await res.json()) as { ok: boolean; items?: SoundtrackOption[] }
+    cachedOptions = json.items ?? []
+    inflight = null
+    return cachedOptions
+  })()
+  return inflight
+}
+
+export function getCachedSongPickerOptions(): SoundtrackOption[] | null {
+  return cachedOptions
+}
+
+/** Clear the cache so new uploads show up on next open. */
+export function invalidateSongPickerCache(): void {
+  cachedOptions = null
+}
+