fix: home visual feedback round — soft bg for features, branded placeholder, plan 10j

- advantages section gains section--soft (white cards were invisible on white)
- .pro-art placeholder redesigned: brand gradient + initials + small kind
  label, ring ornament hidden (was heavy gray block)
- plan: new Task 10j (port cms header/footer chrome visuals) per user
  feedback that overall look should match cms
- verified live: mirror build 7f1e8c47f0c4 (374/384 real images pulled,
  203 pages, 0 errors)

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

themes/trade-pro/pages/home.html

@@ -105,7 +105,7 @@
   </div>
 </section>
 {% endif %}
-<section class="section">
+<section class="section section--soft">
   <div class="wrap">
     <div class="sf-tp-section-head" data-reveal>
       <div>