fix: skip overlay background on solid colour and gradient hero modes

The overlay's semi-transparent background was covering the gradient,
making it invisible. Color/gradient modes use controlled backgrounds
that don't need an overlay for text readability — the card handles
that. Overlay layout (flex positioning) is preserved.

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/tmpl/default.php

@@ -62,7 +62,10 @@ $overlayDirections = [
 	'gradient-right'  => 'to right',
 ];
 
-if ($overlayType !== 'solid' && isset($overlayDirections[$overlayType])) {
+// Skip overlay on solid colour/gradient modes — background is already a controlled design choice
+if ($heroMode === 'color' || $heroMode === 'gradient') {
+	$overlayBg = '';
+} elseif ($overlayType !== 'solid' && isset($overlayDirections[$overlayType])) {
 	$dir = $overlayDirections[$overlayType];
 	$overlayBg = "background: linear-gradient($dir, $rgbaTransparent, $rgbaOpaque);";
 } else {