Add audio filetype to treemap

[chromy]

Partially resolves EME-443

[linear]

EME-443 audio files as `category: files`

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.01%. Comparing base (f87a622) to head (205d52b).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #428      +/-   ##
==========================================
+ Coverage   80.71%   81.01%   +0.30%     
==========================================
  Files         149      156       +7     
  Lines       12131    12720     +589     
  Branches     1222     1284      +62     
==========================================
+ Hits         9791    10305     +514     
- Misses       1894     1957      +63     
- Partials      446      458      +12     

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