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>

themes/modern/assets/style.css

@@ -366,18 +366,22 @@ a:hover {
     max-width: 100%;
 }
 .pagination-info {
+    background: var(--bg);
+    border: 1px solid var(--border);
+    border-radius: 6px;
     color: var(--muted);
     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 14px;
+    padding: 6px 10px;
     border: 1px solid var(--border);
     border-radius: 6px;
-    font-size: 14px;
+    font-size: 13px;
     background: var(--card);
     color: var(--text);
 }
@@ -389,6 +393,19 @@ a:hover {
 .pagination-links .disabled {
     color: var(--muted);
 }
+.theme-inject {
+    margin: 12px 0;
+    max-width: 100%;
+    overflow: hidden;
+}
+.theme-inject:empty {
+    display: none;
+}
+.theme-inject img,
+.theme-inject iframe {
+    max-width: 100%;
+    height: auto;
+}
 
 .m-footer {
     border-top: 1px solid var(--border);