fix: hotkeys properties support

[Jerricho93]

Fixes #1260

Changes the getter function for hotkeys to detect as attribute list instead of plain string.

Also fixes minor typo in docs

---

Note

Medium Risk
Changes the public MediaController.hotkeys getter from a string to an AttributeTokenList, which may break consumers that read it as a plain attribute value even though it matches documented/expected usage.

Overview
Fixes MediaController.hotkeys to return the internal AttributeTokenList (rather than the raw hotkeys attribute string), enabling programmatic add/remove usage to correctly reflect and update allowed keyboard shortcuts.

Also fixes a typo in the keyboard shortcuts docs example (mc.hotkeys.add(...)) by correcting the missing quote.

^{Written by Cursor Bugbot for commit eb8ce97. This will update automatically on new commits. Configure here.}

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✅ Snyk checks have passed. No issues have been found so far.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.61%. Comparing base (3ea80df) to head (eb8ce97).
⚠️ Report is 281 commits behind head on main.

Files with missing lines	Patch %	Lines
src/js/media-controller.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1266      +/-   ##
==========================================
- Coverage   78.55%   73.61%   -4.95%     
==========================================
  Files          59       56       -3     
  Lines       11080    13844    +2764     
  Branches        0      784     +784     
==========================================
+ Hits         8704    10191    +1487     
- Misses       2376     3619    +1243     
- Partials        0       34      +34     

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