Count Read Aloud media session controls as user activity

[cdrini]

Description

Patrons listening to a book with Read Aloud can have it returned out from under them ("This book has been returned due to inactivity"). A 1-hour browse loan only auto-renews when ia-book-actions sees a BookReader:userAction, and BookReader only emitted that on page-index changes and navbar button clicks — so someone who is listening rather than clicking looks idle.

Media session controls (lock screen, notification shade, headset buttons) now count as user activity, so using them renews the loan. The signal is also widened generally: it now comes from listeners over the whole reader, including the read aloud toolbar's dropdowns and the item-navigator side menu, instead of an enumerated list of navbar buttons.

This helps but does not fully fix it — a patron who listens for a straight hour without touching anything can still be returned. That needs a different strategy.

Testing

1. Go to https://deploy-preview-1597--ia-bookreader.netlify.app/bookreaderdemo/demo-internetarchive?ocaid=theworksofplato01platiala
2. In the console, run: window.addEventListener('BookReader:userAction', () => console.log('userAction', new Date()))
3. Start Read Aloud, then pause/resume from your OS media controls (lock screen, notification shade, or headset button) — each press should log userAction.
4. Click the read aloud toolbar buttons, the speed and voice dropdowns, and anything in the side menu — each should log userAction.
5. Check the navbar still behaves normally: page turn, zoom, view mode and fullscreen should all work, and log userAction once per click.

[codecov]

Codecov Report

❌ Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.79%. Comparing base (882adbc) to head (1698eab).

Files with missing lines	Patch %	Lines
src/plugins/tts/WebTTSEngine.js	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1597      +/-   ##
==========================================
- Coverage   63.81%   63.79%   -0.02%     
==========================================
  Files          69       69              
  Lines        6256     6272      +16     
  Branches     1391     1394       +3     
==========================================
+ Hits         3992     4001       +9     
- Misses       2225     2232       +7     
  Partials       39       39              

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