form fix: enhance form state merging with error map support

🎯 Changes

We reverted FormApi.validateSync to store global errors only as existing string formats, ensuring form state and field meta synchronization remains compatible with previous behavior.
We added a regression test to verify that field metadata is passed when errors delivered from the server are merged using mergeForm.

✅ Checklist

[x] I have followed the steps in the Contributing guide.
[x] I have tested this code locally with pnpm test:pr.

🚀 Release Impact

[x] This change affects published code, and I have generated a changeset.
[x] This change is docs/CI/dev-only (no release).

Oct 24 '25 09:10 jiji-hoon96

⚠️ No Changeset found

Latest commit: cbaae227f43bc27f8ecb7139c91b9be4322caa4e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Oct 24 '25 09:10 changeset-bot[bot]

View your CI Pipeline Execution ↗ for commit cbaae227f43bc27f8ecb7139c91b9be4322caa4e

Command	Status	Duration	Result
`nx affected --targets=test:sherif,test:knip,tes...`	✅ Succeeded	1m 29s	View ↗
`nx run-many --target=build --exclude=examples/**`	✅ Succeeded	25s	View ↗

☁️ Nx Cloud last updated this comment at 2025-10-24 09:41:49 UTC

Oct 24 '25 09:10 nx-cloud[bot]

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commit: cbaae22

Oct 24 '25 09:10 pkg-pr-new[bot]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 90.72%. Comparing base (6892ed0) to head (cbaae22). :warning: Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1824      +/-   ##
==========================================
+ Coverage   90.35%   90.72%   +0.36%     
==========================================
  Files          38       38              
  Lines        1752     1811      +59     
  Branches      444      468      +24     
==========================================
+ Hits         1583     1643      +60     
+ Misses        149      148       -1     
  Partials       20       20

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Oct 24 '25 09:10 codecov[bot]