fix(frontend): unbreak single post layout cascade

Disable the global 2-col .content-layout grid on single pages (it was
tiling breadcrumb/article/author/related/comments left-right), add the
missing Zibll utility bridge used by the author/meta bar, and replace
nonstandard <name>/<item>/<badge> tags in the single surface.

assets/css/frontend/single-post/author-actions.css

@@ -98,6 +98,12 @@
 }
 
 /* ===== Action Buttons Card ===== */
+.post-actions-wrap {
+    position: relative;
+    text-align: center;
+    margin-bottom: 16px;
+}
+
 .post-actions-card,
 .post-actions {
     position: relative;
@@ -105,6 +111,10 @@
     margin-bottom: 16px;
 }
 
+.post-actions-wrap > .post-actions {
+    margin-bottom: 0;
+}
+
 .post-actions-card__hint {
     font-size: 13px;
     color: var(--color-ink-4, var(--color-ink-4));
@@ -482,9 +492,13 @@ html.dark .post-drop-meta__item:hover {
   gap: 0;
 }
 
-.single-metabox .post-metas item {
+.single-metabox .post-metas item,
+.single-metabox .post-metas .item {
   margin: 0 6px;
   font-size: 13px;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
 }
 
 .single-metabox .post-drop-meta {