fix: thumbnail preview sizing

[Jerricho93]

Closes #1160

Added property of "object-fit: fill" to the thumbnail preview component to allow for more dimensions, such as square thumbnail previews, or if the user wants the height to be greater than width. This will however most likely result in a stretched preview of the video to match the new aspect ratio

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Project	Deployment	Actions	Updated (UTC)
media-chrome	Ready	Preview, Comment	Feb 19, 2026 6:53pm
media-chrome-demo-nextjs	Ready	Preview, Comment	Feb 19, 2026 6:53pm
media-chrome-docs	Ready	Preview, Comment	Feb 19, 2026 6:53pm

[codecov]

Codecov Report

❌ Patch coverage is 6.06061% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.61%. Comparing base (3ea80df) to head (9f46cda).
⚠️ Report is 278 commits behind head on main.

Files with missing lines	Patch %	Lines
src/js/media-preview-thumbnail.ts	3.12%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1262      +/-   ##
==========================================
- 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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