feat(frontend): deepen single post 1:1 parity with Zibll

Split related style/source settings, add subtitle/meta/allow-view helpers, align cover/author/tags/pay shell markup and CSS with Zibll single.

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

@@ -540,3 +540,11 @@ html.dark .post-drop-meta__item:hover {
 .post-actions .action i {
   font-size: 16px;
 }
+
+
+.article-tags br { flex-basis: 100%; width: 100%; content: ""; display: block; height: 0; }
+.article-tags .but.c-blue { color: #2196f3; }
+.article-tags .but.c-yellow { color: #f0ad4e; }
+.article-tags .but.c-green { color: #5cb85c; }
+.article-tags .but.c-purple { color: #9c27b0; }
+.article-tags .but.c-red { color: #f44336; }