fix(core): fix formOptions type inferance

[harry-whorlow]

Relates to #1613, this pr introduces more tests to form options, as well as fixes the typing error.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit eb9d5da

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 31s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	20s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-08-12 09:32:14 UTC

[pkg-pr-new]

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commit: eb9d5da

[codecov]

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1687   +/-   ##
=======================================
  Coverage        ?   90.52%           
=======================================
  Files           ?       37           
  Lines           ?     1688           
  Branches        ?      421           
=======================================
  Hits            ?     1528           
  Misses          ?      143           
  Partials        ?       17           

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