fix(form-core): Fix memory leaks from EventClient

[LeCarbonator]

🎯 Changes

The PR addresses two memory leaks related to the EventClient:

• Unsubscribe from event listeners on cleanup
• Fix queuedEvents from piling up FormApi references

🚀 Release Impact

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 01f1ce3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@tanstack/form-core	Patch
@tanstack/angular-form	Patch
@tanstack/form-devtools	Patch
@tanstack/lit-form	Patch
@tanstack/react-form	Patch
@tanstack/solid-form	Patch
@tanstack/svelte-form	Patch
@tanstack/vue-form	Patch
@tanstack/react-form-devtools	Patch
@tanstack/solid-form-devtools	Patch
@tanstack/react-form-nextjs	Patch
@tanstack/react-form-remix	Patch
@tanstack/react-form-start	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 01f1ce3

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 48s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	35s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-12-18 09:52:47 UTC

[pkg-pr-new]

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• @tanstack/form-example-react-array
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• @tanstack/form-example-svelte-standard-schema
• @tanstack/form-example-vue-array
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• @tanstack/form-example-vue-standard-schema

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commit: 01f1ce3

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.41%. Comparing base (6892ed0) to head (01f1ce3).
⚠️ Report is 101 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/form-core/src/FormApi.ts	25.00%	12 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1866      +/-   ##
==========================================
- Coverage   90.35%   89.41%   -0.94%     
==========================================
  Files          38       48      +10     
  Lines        1752     1937     +185     
  Branches      444      483      +39     
==========================================
+ Hits         1583     1732     +149     
- Misses        149      184      +35     
- Partials       20       21       +1     

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[LeCarbonator]

Related PR: TanStack/devtools#272

[martinliptak]

Also experiencing this, I made the forms client only to temporarily mitigate the issue.