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/nav/base.css

@@ -294,8 +294,8 @@ ul.nav-desktop .sub-menu {
   margin: 8px 0 0;
   padding: 8px 6px;
   background: var(--main-bg-color, #fff);
-  border: 1px solid rgba(255, 255, 255, 0.55);
-  border-radius: var(--radius-lg, 10px);
+  border: none;
+  border-radius: var(--main-radius, var(--radius, 8px));
   box-shadow: var(--shadow-lg);
   opacity: 0;
   visibility: hidden;