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A <select> element can have a multiple attribute, in which case it will populate an array rather than selecting a single value.

Replace the checkboxes with a <select multiple>:

App.svelte
<h2>Flavours</h2>

<select multiple bind:value={flavours}>
	{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
		<option>{flavour}</option>
	{/each}
</select>

Note that we're able to omit the value attribute on the <option>, since the value is identical to the element's contents.

Press and hold the control key (or the command key on MacOS) to select multiple options.

Next: Textarea inputs

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<script>
	let scoops = 1;
	let flavours = [];
 
	const formatter = new Intl.ListFormat('en', { style: 'long', type: 'conjunction' });
</script>
 
<h2>Size</h2>
 
{#each [1, 2, 3] as number}
	<label>
		<input
			type="radio"
			name="scoops"
			value={number}
			bind:group={scoops}
		/>
 
		{number} {number === 1 ? 'scoop' : 'scoops'}
	</label>
{/each}
 
<h2>Flavours</h2>
 
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
	<label>
		<input
			type="checkbox"
			name="flavours"
			value={flavour}
			bind:group={flavours}
		/>
 
		{flavour}
	</label>
{/each}
 
{#if flavours.length === 0}
	<p>Please select at least one flavour</p>
{:else if flavours.length > scoops}
	<p>Can't order more flavours than scoops!</p>
{:else}
	<p>
		You ordered {scoops} {scoops === 1 ? 'scoop' : 'scoops'}
		of {formatter.format(flavours)}
	</p>
{/if}
initialising