feat(admin): 独立后台壳、站点分析与聊天监管，公开站拆出主题切换与访问埋点

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

frontend/components/admin/AdminSearchField.tsx

@@ -3,7 +3,7 @@
 import { Search, X } from "lucide-react";
 import type { FormEvent } from "react";
 
-/** 左图标、可清除、Enter 提交；壳层聚焦与聊天搜索一致 */
+/** 左图标、可清除、Enter 提交；加高壳层便于后台工具条点按 */
 export default function AdminSearchField({
   value,
   onChange,
@@ -30,9 +30,13 @@ export default function AdminSearchField({
   };
 
   return (
-    <form onSubmit={handleSubmit} className="admin-field-shell admin-search-shell relative flex-1 min-w-0" role="search">
+    <form
+      onSubmit={handleSubmit}
+      className="admin-field-shell admin-search-shell relative flex-1 min-w-0"
+      role="search"
+    >
       <Search
-        size={15}
+        size={17}
         className="shrink-0 pointer-events-none"
         style={{ color: value ? "var(--accent)" : "var(--ink-3)" }}
         aria-hidden
@@ -50,10 +54,10 @@ export default function AdminSearchField({
           type="button"
           onClick={clear}
           aria-label="清除搜索"
-          className="w-6 h-6 inline-flex items-center justify-center rounded-full shrink-0 transition-colors hover:bg-[var(--accent-soft)]"
+          className="w-7 h-7 inline-flex items-center justify-center rounded-full shrink-0 transition-colors hover:bg-[var(--accent-soft)]"
           style={{ color: "var(--ink-3)" }}
         >
-          <X size={14} />
+          <X size={15} />
         </button>
       ) : null}
     </form>