Fix mobile top spacing (double header offset) + CTA/newsletter gap

On mobile, body already has padding-top:60px to clear the fixed header, but
every page ALSO added its own clearance — doubling it and leaving a ~60px
white gap under the menu (content sat too low). Trimmed each page's mobile
top offset so it relies on the body padding (matching .article-page, which
was already correct): page-content, support/hub/legal pages, and the
news-hub / news-article / blog / member heroes. Content now sits ~32-42px
under the header.

Also add a 32px top gap to .newsletter-cta on mobile so it no longer
touches the CTA/content above it.

CSS only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

css/pages/_article.css

@@ -605,7 +605,8 @@
     }
 
     .newsletter-cta {
-        padding: 0 24px 64px 24px;
+        /* top gap so the box doesn't touch the CTA/content above it on mobile */
+        padding: 32px 24px 64px 24px;
     }
 
     .newsletter-cta .container {