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/_member.css

@@ -233,6 +233,10 @@
     .mm-hero-collage { height: 340px; }
     .mm-who { grid-template-columns: 1fr; }
 }
+@media (max-width: 768px) {
+    /* body already offsets the fixed header on mobile — trim the hero's top. */
+    .mm-hero { padding-top: 40px; }
+}
 @media (max-width: 600px) {
     .mm-h2 { font-size: 26px; }
     .ms-grid, .ms-paths { grid-template-columns: 1fr; }