fix: restyle pager chips and restore theme ad slots

Replace the loose page-count label with a SaBlog-style 6 / 316 chip, wire inject/stylevar HTML into list and post views, and flush page cache when ads are saved.

Co-authored-by: Cursor <cursoragent@cursor.com>

public/css/blog.css

@@ -444,18 +444,22 @@ a:hover {
     max-width: 100%;
 }
 .pagination-info {
-    color: #888;
+    background: #f5f7fb;
+    border: 1px solid #d5dbe6;
+    border-radius: 6px;
+    color: #556;
     font-size: 13px;
-    margin-right: 6px;
+    padding: 6px 10px;
+    margin-right: 4px;
     white-space: nowrap;
 }
 .pagination-links a,
 .pagination-links .current,
 .pagination-links .disabled {
-    padding: 6px 12px;
+    padding: 6px 10px;
     border: 1px solid #ddd;
     border-radius: 6px;
-    font-size: 14px;
+    font-size: 13px;
     background: #fff;
 }
 .pagination-links .current {
@@ -466,6 +470,19 @@ a:hover {
 .pagination-links .disabled {
     color: #bbb;
 }
+.theme-inject {
+    margin: 10px 0;
+    max-width: 100%;
+    overflow: hidden;
+}
+.theme-inject:empty {
+    display: none;
+}
+.theme-inject img,
+.theme-inject iframe {
+    max-width: 100%;
+    height: auto;
+}
 
 .auth-layout {
     display: flex;