fix(types): remove deprecated FormEventHandler override from SharedFormProps

[restareaByWeezy]

Closes #14795

SharedFormProps was explicitly declaring onSubmit as React.FormEventHandler<HTMLFormElement>, which is now deprecated in @types/[email protected]. The thing is, SharedFormProps already extends React.FormHTMLAttributes<HTMLFormElement> — which inherits onSubmit from DOMAttributes. So the explicit declaration was just overriding whatever @types/react provides with a hardcoded (now-deprecated) type.

Removing it lets the type flow naturally from the parent interface:

• @types/[email protected] users get FormEventHandler<T> (same as before)
• @types/[email protected] users get SubmitEventHandler<T> (no more deprecation warning)

This addresses @timdorr's concern about not breaking users on older React types — since we're not picking a side, we're just letting @types/react decide.

[changeset-bot]

🦋 Changeset detected

Latest commit: bf968a1

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

This PR includes changesets to release 11 packages

Name	Type
react-router	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/dev	Patch
react-router-dom	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch
@react-router/fs-routes	Patch
@react-router/remix-routes-option-adapter	Patch
create-react-router	Patch

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