feat: allow files=null in Input, to match SvelteKit remote forms

[osvein]

<input type="file" files={null} /> is valid for the HTML input tag, so the Input component should also allow it.

This is especially useful when using SvelteKit remote forms .as('file'), which includes files=null in its return type. Without this change, this causes a type error: <Input {...form.fields.as('file')} />

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Pull request overview

Updates the Input UI component’s TypeScript props to accept files={null} for type="file", aligning the component’s typing with the underlying HTML input behavior and improving compatibility with SvelteKit remote forms (.as('file')).

Changes:

• Allow files?: FileList | null when type: "file" in the Input component props.
• Preserve the existing restriction that files is not allowed for non-file input types.

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