style: update card header color for related tips section

Author: csharpfritz

Web/Pages/Tips/Details.cshtml

@@ -176,9 +176,8 @@
             <div class="sticky-top" style="top: 2rem; z-index: var(--z-index-sticky);">
                 <!-- Related Tips -->
                 @if (Model.ViewModel.RelatedTips.Any())
-                {
-                    <div class="card shadow-sm mb-4">
-                        <div class="card-header bg-light">
+                {                    <div class="card shadow-sm mb-4">
+                        <div class="card-header bg-primary text-white">
                             <h5 class="card-title mb-0">
                                 <i class="bi bi-lightbulb"></i> Related Tips
                             </h5>