fix(nav): never drop top-nav 发布 when submit page URL is empty

aksrt_get_new_post_url() returns '' without a page-submit assignment,
which previously skipped the post action and emptied the multi-type
chip. Fall back to post-new.php, keep a last-resort action list, put
radius/jb paint on the toggle, and force chip visibility CSS.

assets/css/frontend/nav/header-menu-buttons.css

@@ -67,9 +67,14 @@
 /* Multi-type toggle lives outside .navbar-but-cluster on live zibll DOM.
  * Paint classes (jb-*) set --this-bg on the toggle; force them to show. */
 .navbar-top .navbar-form.navbar-but .newadd-btns__toggle.navbar-cta,
-.navbar-top .navbar-but .newadd-btns__toggle.navbar-cta {
+.navbar-top .navbar-but .newadd-btns__toggle.navbar-cta,
+.navbar-top .navbar-form.navbar-but a.navbar-newposts.navbar-cta,
+.navbar-top .navbar-form.navbar-but a.newadd-btns.navbar-cta {
+  display: inline-flex !important;
+  visibility: visible !important;
+  opacity: 1 !important;
   color: #fff !important;
-  background: var(--this-bg, var(--color-primary, #2f6df6)) !important;
+  background: var(--this-bg, linear-gradient(135deg, #59c3fb 10%, #268df7 100%)) !important;
   border-radius: var(--navbar-cta-radius, 50px);
   cursor: pointer;
 }
@@ -798,3 +803,20 @@ body.dark-theme .toggle-theme .theme-icon-sun {
     width: min(220px, 42vw);
   }
 }
+
+
+/* Ensure publish form is never zero-sized */
+.navbar-top .navbar-form.navbar-but {
+  display: flex !important;
+  align-items: center !important;
+  visibility: visible !important;
+  min-width: 0;
+  flex: 0 0 auto;
+}
+.navbar-top .navbar-form.navbar-but .newadd-btns.hover-show {
+  display: block !important;
+  visibility: visible !important;
+  width: fit-content !important;
+  max-width: fit-content !important;
+  line-height: normal !important;
+}