fix(visual): 1:1 banner/hero/modal + strip non-zibll card chrome

Align banner s-desc caption/scale-height, hero search pill and -40px cards, modal colorful header/spring scale; remove white/pink card borders and hover lifts across mainline surfaces.

assets/css/frontend/single-post/related-toc.css

@@ -44,7 +44,7 @@
     margin-bottom: 16px;
     overflow: hidden;
     background: var(--surface-1, #fff);
-    border: 1px solid rgba(255, 255, 255, 0.55);
+    border: none;
     border-radius: var(--radius-2xl, 16px);
     box-shadow: var(--shadow-sm);
 }
@@ -251,7 +251,7 @@ html.dark .article-end-separator span {
     top: 88px;
     padding: 18px 18px 14px;
     margin-bottom: 16px;
-    border: 1px solid rgba(255, 255, 255, 0.55);
+    border: none;
     border-radius: var(--radius-2xl, 16px);
     box-shadow: var(--shadow-sm);
     background: var(--surface-1);