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/author-actions.css

@@ -136,7 +136,6 @@
 
 .action-btn:hover,
 .action:hover {
-    border-color: rgba(240, 68, 148, 0.12);
     background: var(--color-primary-soft);
     color: var(--color-primary);
 }
@@ -300,7 +299,7 @@ html.dark .post-drop-meta__item:hover {
     margin-bottom: 16px;
     padding: 18px;
     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);
 }

assets/css/frontend/single-post/navigation.css

@@ -17,14 +17,13 @@
   display: block;
   padding: 18px;
   border-radius: var(--radius-lg);
-  border: 1px solid rgba(255, 255, 255, 0.55);
+  border: none;
   box-shadow: var(--shadow-sm);
   background: var(--surface-1);
   transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
 }
 
 .post-nav-links a:hover {
-  border-color: rgba(240, 68, 148, 0.12);
   box-shadow: var(--shadow);
   transform: translateY(-2px);
 }

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);