chore: upgrade to tailwind v4 (#18353)

web/src/lib/components/elements/radio-button.svelte

@@ -10,7 +10,7 @@
   let { id, label, name, value, group = $bindable(undefined) }: Props = $props();
 </script>
 
-<div class="flex items-center space-x-2">
+<div class="flex items-center gap-2">
   <input type="radio" {name} {id} {value} class="focus-visible:ring" bind:group />
   <label for={id}>{label}</label>
 </div>