fix: address code review issues and rebuild CSS

- nav: add functional mobile menu panel with JS toggle
- nav: hamburger now shows/hides mobile-menu with aria-expanded state
- about_page: full styled layout (header, prose body, author aside)
- legal_page: full styled layout (header with last-updated, max-w-3xl prose)
- article: fix aside newsletter label to 'Subscribe' for E2E test
- CSS: rebuild after all template changes (4.8KB → 24.3KB)
  Committed CSS must match CI build — rebuilt after ALL template edits

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/legal/legal_page.html

@@ -1,7 +1,18 @@
 {% extends 'base.html' %}
 {% load wagtailcore_tags %}
+{% block title %}{{ page.title }} | No Hype AI{% endblock %}
 {% block content %}
-<h1>{{ page.title }}</h1>
-<p>Last updated: {{ page.last_updated|date:'F Y' }}</p>
-{{ page.body|richtext }}
+
+<!-- Page Header -->
+<div class="py-8 md:py-12 border-b border-zinc-200 dark:border-zinc-800 mb-12">
+  <h1 class="font-display font-black text-4xl md:text-5xl mb-3">{{ page.title }}</h1>
+  <p class="font-mono text-sm text-zinc-500">Last updated: {{ page.last_updated|date:'F Y' }}</p>
+</div>
+
+<!-- Body -->
+<div class="max-w-3xl prose prose-lg dark:prose-invert
+  prose-headings:font-display prose-headings:font-bold
+  prose-a:text-brand-cyan hover:prose-a:text-brand-pink prose-a:transition-colors prose-a:no-underline hover:prose-a:underline">
+  {{ page.body|richtext }}
+</div>
 {% endblock %}