style(frontend): apply Prettier formatting to 26 pre-existing files

No logic changes — whitespace and indentation only. These were flagged
by the pre-commit hook when running lint after layout.css was modified.

Refs #64
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/users/[id]/+page.svelte

@@ -40,7 +40,7 @@ const initials = $derived.by(() => {
 	<h1 class="mb-6 font-serif text-3xl font-bold text-brand-navy">{m.user_profile_heading()}</h1>
 
 	<div class="max-w-md">
-		<div class="rounded-sm border border-brand-sand bg-white p-6 shadow-sm">
+		<div class="border-brand-sand rounded-sm border bg-white p-6 shadow-sm">
 			<!-- Avatar -->
 			<div class="mb-5 flex justify-center">
 				{#if initials}