Save to Files: copy books, free audiobooks and Verse By Verse lessons and handouts into Seafile (background job, progress, skips what is there)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaC9HmtHMdRP8dAbN4wAKj

public/index.html

@@ -75,6 +75,7 @@
 <script src="/audiobooks-view.js"></script>
 <script src="/librivox-view.js"></script>
 <script src="/radio-view.js"></script>
+<script src="/save-to-files.js"></script>
 <script src="/vbv-view.js"></script>
 <script src="/lyrics-view.js"></script>
 <script src="/settings.js"></script>