Fix loading .json.gz profiles from inside zip archives

[canova]

This fixes #5958.

When clicking a .json.gz entry in a zip file, viewProfileFromZip called file.async('string'), which decoded the gzip bytes as UTF-8 and corrupted the stream before unserializeProfileOfArbitraryFormat could detect the gzip magic and decompress. Switching to 'uint8array' keeps the content binary so the existing isGzip/decompress path runs. Plain .json entries still work via the Uint8Array to TextDecoder fallback.

Example profile

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.33%. Comparing base (4308a73) to head (285d242).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5959      +/-   ##
==========================================
- Coverage   85.37%   85.33%   -0.04%     
==========================================
  Files         322      322              
  Lines       32069    32117      +48     
  Branches     8814     8827      +13     
==========================================
+ Hits        27378    27408      +30     
- Misses       4260     4278      +18     
  Partials      431      431              

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[fatadel]

LGTM 👍🏻