feat: page banners use the page's Featured Image when set

- Theme design pages (About, Contact, FAQ, blog list) use the page's Featured
  Image (Posts page for the blog) and fall back to the design photo; no teal
  tint over a custom image
- Plugin hero (homepage [viator_hero], [viator_listing] pages) prefers the
  hosting page's Featured Image over the Settings hero image
- Theme 1.0.12, plugin 1.9.4

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

astra-child-hoponhopoff/templates/about.php

@@ -9,7 +9,7 @@ get_header();
 <main id="main" class="hoho-page">
     <section class="hero hero--page hero--about">
       <div class="hero__media">
-        <img class="hero__img" src="<?php echo esc_url( hoho_asset( 'img/about-hero.webp' ) ); ?>" alt="" fetchpriority="high" />
+        <img class="hero__img" src="<?php echo esc_url( hoho_banner_url( 'about-hero' ) ); ?>" alt="" fetchpriority="high" />
       </div>
 
       <div class="container hero__content">