Audiobooks: built-in library, playback and synced progress through the audiobook player (classic frame kept)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

package.json

@@ -5,7 +5,7 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
-    "test": "for t in smoke tasks push users cal plex player lyrics signal mail mail-imap files podcast; do node tools/$t-test.js || exit 1; done",
+    "test": "for t in smoke tasks push users cal plex player lyrics signal mail mail-imap files podcast abapi; do node tools/$t-test.js || exit 1; done",
     "audit": "npm audit --omit=dev --audit-level=high"
   },
   "keywords": [],