Phase 13C book-card visual refinement.

PlotLine/Views/Projects/Details.cshtml

@@ -104,14 +104,14 @@
         <div class="row g-4">
             @foreach (var book in Model.Books)
             {
-                <div class="col-12 col-md-6 col-xl-4 col-xxl-3">
+                <div class="col-12 col-md-6 col-lg-4">
                     <article class="card h-100 overflow-hidden">
                         <div class="row g-0 h-100">
-                            <div class="col-4">
+                            <div class="col-4 d-flex align-items-center justify-content-center" style="aspect-ratio:2 / 3; background:var(--plotline-soft);">
                                 <img src="@book.CoverThumbnailPath"
                                      alt="Cover for @book.BookTitle"
-                                     class="img-fluid h-100 w-100"
-                                     style="aspect-ratio:2 / 3; object-fit:cover; min-height:220px;" />
+                                     class="img-fluid"
+                                     style="max-width:100%; max-height:100%; object-fit:contain;" />
                             </div>
                             <div class="col-8">
                                 <div class="card-body h-100 d-flex flex-column">