fix: missing hasBeenSeen variable definition in IsInViewport docs example

[jfreyberg]

This example in the documentation has been added with this PR that added support for the once parameter:

<script lang="ts">
	import { IsInViewport } from "runed";

	let targetNode = $state<HTMLElement>()!;
	const inViewport = new IsInViewport(() => targetNode, {
		once: true
	});
</script>

<div bind:this={targetNode} class="transition" class="transition-opacity {hasBeenSeen ? 'opacity-100' : 'opacity-0'}">

However, the hasBeenSeen variable is not defined in this example. Adding a const hasBeenSeen = $derived(inViewport.current); makes the example code valid.

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