feat: Enhance gallery functionality with lightbox feature and improve icon sprite accessibility

- Added a lightbox feature for gallery images, allowing users to view photos in a modal with navigation controls.
- Updated the SVG sprite to include inline styles for better accessibility.
- Increased CSS specificity by doubling the `.vc-app` class to ensure styles override Astra theme defaults.
- Introduced new shortcodes for bus tours, about section, and articles in the VC_Sections class.
- Improved the handling of featured images in the single tour template for sharper display.
- Updated version number to 1.8.15.

viator-collector/templates/single-viator_tour.php

@@ -38,9 +38,18 @@ while ( have_posts() ) :
 	?>
 	<div class="vc-app vc-single">
 		<section class="hero-tour">
-			<?php if ( $primary ) : ?>
+			<?php
+			// Prefer a WordPress featured image (full size, responsive srcset) for a
+			// sharp hero — Viator's own image URLs cap out around 720px and look soft
+			// blown up to a full-width banner. Fall back to the Viator primary image.
+			if ( has_post_thumbnail( $post_id ) ) :
+				echo get_the_post_thumbnail( $post_id, 'full', array( 'class' => 'hero-tour__photo', 'fetchpriority' => 'high', 'alt' => '', 'sizes' => '100vw' ) ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+			elseif ( $primary ) :
+				?>
 				<img class="hero-tour__photo" src="<?php echo esc_url( $primary ); ?>" alt="" fetchpriority="high">
-			<?php endif; ?>
+				<?php
+			endif;
+			?>
 			<div class="hero-tour__sky" aria-hidden="true"></div>
 			<div class="container">
 				<div class="hero-tour__block">