fix(ui): use mt-6 on save bar to match card spacing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/persons/[id]/edit/PersonEditSaveBar.svelte

@@ -5,7 +5,7 @@ let { discardHref, formId }: { discardHref: string; formId?: string } = $props()
 </script>
 
 <div
-	class="mt-4 flex items-center justify-between rounded-sm border border-line bg-surface px-6 py-4 shadow-sm"
+	class="mt-6 flex items-center justify-between rounded-sm border border-line bg-surface px-6 py-4 shadow-sm"
 >
 	<a href={discardHref} class="text-sm font-medium text-ink-2 transition-colors hover:text-ink">
 		{m.person_discard_changes()}