fix(skeleton): align the homepage tab and sort loaders with the reference 1:1

首页「更多栏目」tab 与「排序方式」切换的骨架占位与参考主题 zibll 有实质差异，
根因不是几何宽度，而是三处结构/契约错位：

1. 骨架块自身结构与参考主题不同。card 分支用了 `<posts>` 元素 + `.post-graphic`
   包裹层（列表变体，带 margin-right:20px），而参考主题 card 骨架是
   `<div class="posts-item card">` 且 `.item-thumbnail` 是直接子元素。
   → card 骨架右侧多出一条真实卡片没有的 20px 沟槽。

2. 骨架块被错误地打上 `ajax-item`。参考主题的占位块没有该类。它会让
   `find('.ajax-item')` / ajax-list 的 `inject()` 把骨架当成真实条目。

3. 排序切换的骨架被预渲染节点顶替。aksrt_render_pagination() 在 .ajax-pag 内
   渲染了一个写死 2 条、写死 list 形状的 .post_ajax_loader；runtime post_ajax()
   会先在容器内 find('.post_ajax_loader')，找到就复用并丢弃调用方按视口动态
   拼出的骨架 → 切排序永远是 2 条 list 骨架，card 布局下也是、与视口宽度无关。
   参考主题 zib_paging() 根本没有 loader 兄弟节点。

改动：
- inc/helpers/posts-renderer/markup.php：aksrt_render_placeholder() 的
  card/list 分支改为与 zib_get_post_placeholder() 逐字等价的结构；去掉
  ajax-item 类、card 分支的 .post-graphic 包裹层，元素改用 <div>。
- inc/helpers/template-tags/pagination-permissions.php：删除预渲染 loader，
  与参考主题 zib_paging() 一致 —— 只渲染翻页控件。
- assets/js/core/pagination.js：找不到骨架节点时构造与 runtime/main.js 同款
  的文章骨架（卡片 8/6/4 条、列表 4/3 条，按视口与参考主题同阈值），
  不再退化为「转圈 + 文案」这个第二套加载语言；仅评论等非文章面保留该兜底。
- assets/js/core/pagination.js：为排序菜单（.ajax-option）与 tab 触发器
  （.post_ajax_trigger）增加避让 —— 它们归 legacy runtime 管线，
  否则一次点击发两个请求（与 ajax-list.js 的既有避让对称）。
- assets/js/runtime/main.js：post_ajax 的显隐由 fadeIn()/hide() 改为
  .is-loading 类切换。前者写 inline display，优先级高于类规则，一旦残留
  骨架永远打不开，正是骨架契约明令禁止的失败模式。

归档/分类筛选面原本另有一套独立加载语言（spinner 遮罩 + opacity 淡出），
本次一并统一到同一条 .post_ajax_loader + .is-loading 契约：
- inc/helpers/aksrt-archive.php：删除 show_loading 标记位与遮罩 DOM，
  改为在分页之后渲染文章骨架。
- assets/js/core/archive.js：showLoading/hideLoading 只切 .is-loading；
  fetchPosts() 清空内容时保留骨架与分页节点（与参考主题 success 只 hide
  不删的生命周期一致），原先会连带删掉骨架。
- assets/css/frontend/layout.css：删除 .archive__ajax-wrap.is-loading
  的 opacity 淡出与 spinner 遮罩规则。
- category.php / tag.php：删除已失效的 show_loading 实参。

验证：php -l 全部通过；php tools/audit-admin-contracts.php errors=0；
契约测试 post-visual(22) / asset-ledger(16) / message-center(8) /
lazyload(7) / frontend-lifecycle(13) / zibll-modern-widgets(10) /
page-display(18) / a11y 全绿；已重跑 build:public 刷新产物。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/js/runtime/main.js

@@ -1781,7 +1781,9 @@ function post_ajax(_this, con, jcon, item, loader, pag, next, trigger, replace,
                     $con.append($loader);
                 }
 
-                $loader.fadeIn();
+                // 显隐只走 .is-loading 类（modal-runtime.css）；fadeIn()/hide() 会写
+                // inline display，而内联优先级高于类规则，残留后骨架永远打不开。
+                $loader.addClass('is-loading');
                 swiper_tab_AutoHeight($con);
             },
             success: function (a) {
@@ -1837,7 +1839,8 @@ function post_ajax(_this, con, jcon, item, loader, pag, next, trigger, replace,
                 }
 
                 $con.removeAttr('ing').trigger('post_ajax.ed', jQuery(a));
-                find('.post_ajax_loader', $con).hide();
+                // 同 beforeSend：只切换 .is-loading，不写 inline display。
+                find('.post_ajax_loader', $con).removeClass('is-loading');
 
                 if (!_this.attr('no-scroll')) {
                     var _scroll_To = replace ? $con : jQuery(c_c[0]);

assets/js/runtime/main.min.js

@@ -1 +1 @@
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