fix(header): wire multi-function page-type enable like zibll

Connect header_components_show_on through aksrt_header_slide_is_show with
zibll page-type matching, drop the homepage-only gate, align admin options,
apply nav color, enqueue by is_show, remove dead float-btn schema, and
consume footer_tabbar_single extend mode on post singles.

assets/js/post-share.js

@@ -123,8 +123,9 @@
   }
 
   function initShareDropdown() {
-    var trigger = document.getElementById('action-share-trigger');
     var dropdown = document.getElementById('share-dropdown');
+    var triggers = Array.prototype.slice.call(document.querySelectorAll('#action-share-trigger, .action-share[data-type="share"], .footer-tabbar .action-share')).filter(function (el, idx, arr) { return arr.indexOf(el) === idx; });
+    var trigger = triggers[0] || null;
     if (!trigger || !dropdown || dropdown.dataset.aksrtShareBound === '1') return;
 
     dropdown.dataset.aksrtShareBound = '1';
@@ -160,6 +161,16 @@
       toggleDropdown();
     });
 
+    triggers.slice(1).forEach(function (extraTrigger) {
+      extraTrigger.addEventListener('click', function (event) {
+        event.preventDefault();
+        event.stopPropagation();
+        // Reuse primary trigger click semantics by synthetic toggle
+        trigger.click();
+      });
+    });
+
+
     document.addEventListener('click', function (event) {
       if (!trigger.contains(event.target) && !dropdown.contains(event.target)) {
         closeDropdown();