combobox: don't use portal for picker

fixes z-stacking issues when used within dialogs

src/lib/Combobox.svelte

@@ -41,8 +41,7 @@
 	import Label from './Label.svelte';
 	import StyledRawInput from './StyledRawInput.svelte';
 	import { InputValidatorEvent, validate, type ValidatorOptions } from '@svelte-toolkit/validate';
-	import { onMount, tick, untrack, type Snippet } from 'svelte';
-	import { Portal } from '@jsrob/svelte-portal';
+	import { untrack, type Snippet } from 'svelte';
 	import { scale } from 'svelte/transition';
 	import { generateIdentifier, type IconDef } from './util';
 	import type { ClassValue, MouseEventHandler } from 'svelte/elements';
@@ -502,8 +501,7 @@
 <svelte:window onclick={handleWindowClick} />
 
 <!-- Combobox picker -->
-<Portal target="body">
-	{#if open}
+{#if open}
 	<!-- Picker container -->
 	<div
 		class={[
@@ -548,8 +546,7 @@
 			{/if}
 		{/each}
 	</div>
-	{/if}
-</Portal>
+{/if}
 
 <!-- Combobox main input container -->
 <div class={classValue}>