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/inc/pages.php

@@ -54,6 +54,16 @@ function hoho_asset( $path ) {
 	return get_stylesheet_directory_uri() . '/assets/' . ltrim( $path, '/' );
 }
 
+/**
+ * Banner image for a design page: the page's Featured Image when one is set
+ * (for the blog list, the Posts page's), otherwise the design's own photo.
+ */
+function hoho_banner_url( $fallback ) {
+	$page_id = ( is_home() && get_option( 'page_for_posts' ) ) ? (int) get_option( 'page_for_posts' ) : get_queried_object_id();
+	$url     = $page_id ? get_the_post_thumbnail_url( $page_id, 'full' ) : '';
+	return $url ? $url : hoho_asset( 'img/' . $fallback . '.webp' );
+}
+
 /**
  * Social profile links (footer + contact page). Override with the
  * `hoho_socials` filter.