feat(playlists): библиотека плейлистов приложения

CRUD в редакторе, read-only окно на пульте, отдельный аудиоканал, экспорт/импорт и маппинг из Foundry.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/shared/playlists/useAppPlaylists.ts

@@ -0,0 +1,19 @@
+import { useEffect, useState } from 'react';
+
+import { ipcChannels } from '../../../shared/ipc/contracts';
+import type { PlaylistsState } from '../../../shared/types/appPlaylists';
+import { getDndApi } from '../dndApi';
+
+const EMPTY: PlaylistsState = { playlists: [], audios: [] };
+
+export function useAppPlaylists(): PlaylistsState {
+  const api = getDndApi();
+  const [state, setState] = useState<PlaylistsState>(EMPTY);
+
+  useEffect(() => {
+    void api.invoke(ipcChannels.playlists.getState, {}).then(setState);
+    return api.on(ipcChannels.playlists.stateChanged, (next) => setState(next));
+  }, [api]);
+
+  return state;
+}