feat: 添加固定顶部导航和右侧面板粘性效果

Signed-off-by: wangsimiao1 <wangsimiao1@xiaomi.com>

Author: WangSimiao2000

assets/css/jekyll-theme-chirpy.scss

@@ -19,3 +19,24 @@ html {
 html::-webkit-scrollbar {
   display: none; /* Chrome, Safari, Opera */
 }
+
+/* Keep topbar fixed at the top */
+#topbar-wrapper {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  z-index: 1030;
+}
+
+/* Offset body content for fixed topbar */
+#main-wrapper {
+  padding-top: 3rem; /* equals $topbar-height */
+}
+
+/* Keep right panel (trending tags + recent updates) sticky */
+#panel-wrapper .access {
+  position: -webkit-sticky;
+  position: sticky;
+  top: 5rem; /* topbar height + some spacing */
+}