Fix Sound Event Geometry Update Bug

[mbsantiago]

When annotating, updating a sound event's geometry caused it to visually revert to its original state. This was due to a type mismatch between

soundevent.data.Feature (returned by the update function) and the expected whombat.schemas.Feature in the client's validation layer. The difference stems from the recent addition of terms to soundevent.

This PR resolves the issue by correctly casting soundevent.data.Feature to whombat.schemas.Feature before sending the data back to the client. This ensures the validation passes and the updated geometry persists.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.47%. Comparing base (351ff06) to head (e9b4e54).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
back/src/whombat/api/sound_events.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   66.47%   66.47%           
=======================================
  Files         179      179           
  Lines        8367     8367           
=======================================
  Hits         5562     5562           
  Misses       2805     2805           

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