feat(ui): [UI7-1] 构建通用原子UI组件与业务Hooks

client/src/components/common/PageHeader.tsx

@@ -10,8 +10,8 @@ export function PageHeader({ title, subtitle, actions }: PageHeaderProps) {
   return (
     <div className="mb-6 flex flex-wrap items-start justify-between gap-4">
       <div>
-        <h2 className="text-2xl font-bold text-slate-900">{title}</h2>
-        {subtitle ? <p className="mt-1 text-sm text-secondary">{subtitle}</p> : null}
+        <h2 className="text-2xl font-bold tracking-tight text-zinc-900">{title}</h2>
+        {subtitle ? <p className="mt-1 text-sm font-medium text-zinc-500">{subtitle}</p> : null}
       </div>
 
       {actions ? <div className="shrink-0">{actions}</div> : null}