fix(form-core): fix form.resetField() ignoring nested fields

[LeCarbonator]

Closes #1496

See the issue for more details.

The main issue is that the field name was assumed to be a shallow keyof TFormData when it is actually DeepKeys<TFormData>. TypeScript didn't complain because there was an as assertion.

This PR implements the unit test provided in the issue and fixes it.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 0b768c4.

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☁️ Nx Cloud last updated this comment at 2025-05-13 05:09:56 UTC

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commit: 0b768c4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.13%. Comparing base (bfb8c42) to head (0b768c4).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1497      +/-   ##
==========================================
+ Coverage   88.97%   89.13%   +0.15%     
==========================================
  Files          31       31              
  Lines        1397     1417      +20     
  Branches      353      362       +9     
==========================================
+ Hits         1243     1263      +20     
  Misses        137      137              
  Partials       17       17              

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