feat(remote form): expose submitted property

[hrueger]

Hi,
this exposes the submitted property of a remote form. This allows for displaying validity ui for form fields, as they should sometimes only appear after the form being submitted by the user.

I'm not sure if a test for this is needed. If so, please let me know and I'll look into that.

---

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with pnpm test and lint the project with pnpm lint and pnpm check

Changesets

• If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

Edits

• Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1118567

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

This PR includes changesets to release 1 package

Name	Type
@sveltejs/kit	Minor

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

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-14811-svelte.vercel.app/

[Copilot]

Pull request overview

This PR exposes the submitted property of remote forms to enable developers to track whether a form has been submitted at least once. This is particularly useful for controlling when to display form field validity UI, which should typically only appear after the user has attempted to submit the form.

Key Changes

• Made submitted reactive by converting it from a plain variable to $state(false)
• Added a getter for submitted to the RemoteForm object
• Updated TypeScript definitions in both public API and type definition files

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/kit/src/runtime/client/remote-functions/form.svelte.js	Converted submitted to reactive state and exposed it via a getter property
packages/kit/src/exports/public.d.ts	Added TypeScript definition for the submitted getter
packages/kit/types/index.d.ts	Added TypeScript definition for the submitted getter
.changeset/spicy-plants-begin.md	Added changeset documenting this as a minor feature addition

[hrueger]

I added the new feature to a test as Copilot recomended, but I'm unsure why it is undefined sometimes (see the NOTE). any ideas?