fix(form-core): Date comparison in evaluate function for isDefaultValue

[m2na7]

Description

Fixes issue where isDefaultValue was not updating correctly when changing date fields.

Problem

The evaluate function was treating Date objects as regular objects, causing incorrect equality comparisons for date values.

Solution

• Added specific Date object comparison using getTime() method
• Added comprehensive tests for Date object comparison scenarios

Fixes

Closes #1712

[nx-cloud]

View your CI Pipeline Execution ↗ for commit c010d5d

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	2m 1s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	20s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-08-30 11:01:55 UTC

[pkg-pr-new]

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commit: c010d5d

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.53%. Comparing base (24e30ab) to head (c010d5d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1717      +/-   ##
==========================================
+ Coverage   90.52%   90.53%   +0.01%     
==========================================
  Files          37       37              
  Lines        1688     1690       +2     
  Branches      421      422       +1     
==========================================
+ Hits         1528     1530       +2     
  Misses        143      143              
  Partials       17       17              

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