fix(user-home): span the tab pagination skeleton across the post grid

The posts/favorites tabs turn the article list into a 2-column grid at
>=992px. The AJAX pagination skeleton .post_ajax_loader is a direct
child of that grid, so with no grid-column it was laid out as a single
half-width card and the whole placeholder stack collapsed into one
column while paging or switching tabs.

Span the loader across every column and, while loading, give it the
same 2-column template the real cards use so placeholders line up with
them. The skeleton shape now follows the resolved render mode instead
of a hardcoded 'list', so card mode no longer renders list blocks.

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

assets/css/routes/user-home.css

@@ -391,11 +391,32 @@
     margin: 0 !important; /* 抵消 vendored .posts-row > * 的 8px !important 边距 */
   }
 
+  /* 骨架是网格容器自己的直接子节点：不显式跨列，它就会被当成一张卡片，
+     只分到一半宽度，整摞骨架全挤在单列里（翻页 / 切 tab 的占位因此变形）。
+     跨满全部列，并在加载态把 loader 自身变成与真实卡片同款的双列网格，
+     骨架行才会与卡片同宽、同轴、同列数。display 只随 is-loading 打开，
+     未加载时容器仍是 display:none，不会被提前撑开。 */
+  .aksrt-user-home .aksrt-user-home__post-list[data-view="list"] > .post_ajax_loader {
+    grid-column: 1 / -1;
+  }
+
+  .aksrt-user-home .dashboard-panel.is-loading .aksrt-user-home__post-list[data-view="list"] > .post_ajax_loader {
+    display: grid;
+    gap: 16px;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    align-items: start;
+  }
+
   /* 骨架跟随网格走：容器 margin 已归零、卡片边距已清零，
-     不能再叠加 .posts-row > .post_ajax_loader 内层的 8px 补偿。 */
+     不能再叠加 .posts-row > .post_ajax_loader 内层的 8px 补偿；
+     宽高沿用真实卡片的网格单元，所以 vendored site-layout-1 的
+     calc(50% - 16px) 与剩余边距也要一并清零。 */
   .aksrt-user-home .aksrt-user-home__post-list[data-view="list"] > .post_ajax_loader .posts-item {
     margin-right: 0;
     margin-left: 0;
+    margin-top: 0;
+    margin-bottom: 0;
+    width: auto;
   }
 }