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 d1d007a.

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 13s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-05-17 09:10:57 UTC

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commit: d1d007a

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.13%. Comparing base (2a82baa) to head (d1d007a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1497   +/-   ##
=======================================
  Coverage   89.13%   89.13%           
=======================================
  Files          31       31           
  Lines        1417     1417           
  Branches      362      362           
=======================================
  Hits         1263     1263           
  Misses        137      137           
  Partials       17       17           

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[harry-whorlow]

Thats a good catch, and good job on the PR.

Do you mind if I throw on a type test?

[LeCarbonator]

Thats a good catch, and good job on the PR.

Do you mind if I throw on a type test?

Go ahead!