feat(comments): AJAX fragment list/submit + load-more parity

Add REST comment/list + comment/submit HTML fragments, shared query
renderer for order/author/hottest, fix load-more policy and DOM
targets, and stop full-page scrapes for order/author/reload.

assets/js/core/pagination.js

@@ -29,8 +29,13 @@
       if (target && target.classList && target.classList.contains("content-stream__footer")) {
         target = target.previousElementSibling;
       }
+      if (isComment) {
+        var commentList = document.getElementById("comment-list") ||
+          (container.parentElement && container.parentElement.querySelector("#comment-list, .commentlist, ol.commentlist"));
+        if (commentList) target = commentList;
+      }
       if (!target && container.parentElement) {
-        target = container.parentElement.querySelector(".post-grid, .comment-list, .content-stream__list");
+        target = container.parentElement.querySelector(".post-grid, .comment-list, .commentlist, .content-stream__list");
       }
 
       function showSkeleton() {
@@ -79,6 +84,8 @@
         if (isComment && postId) {
           body.set("post_id", postId);
           body.set("comment_order", commentOrder);
+          var authorOnly = container.dataset.authorOnly || "0";
+          if (authorOnly === "1") body.set("author_only", "1");
         }
 
         fetch(aksrtData.ajaxUrl, {
@@ -98,6 +105,9 @@
               while (newItems.length > 0) {
                 target.appendChild(newItems[0]);
               }
+              if (isComment && window.AksrtFrontend) {
+                AksrtFrontend.rehydrate(target, "ajax");
+              }
               nextPage++;
               container.dataset.nextPage = String(nextPage);