fix: compatibility with exactOptionalPropertyTypes

[Stadly]

With exactOptionalPropertyTypes enabled, optional properties cannot be undefined unless explicitly allowed. This commit explicitly allows optional properties to be undefined, making Paneforge usable in projects with exactOptionalPropertyTypes enabled.

The issue was discovered when solving huntabyte/bits-ui#516 and melt-ui/melt-ui#1256. Updating bits-ui and melt-ui solved most of the issues when using shadcn-svelte in a project with exactOptionalPropertyTypes enabled. This PR fixes the issues also for Resizable.

[changeset-bot]

⚠️ No Changeset found

Latest commit: ae86571

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
paneforge	✅ Ready (View Log)	Visit Preview	ae86571

[huntabyte]

Thank you!