fix(ui): [UI7-2] 统一全局 Design Tokens，移除冗余字体，修复异常色值引用

client/src/components/ui/textarea.tsx

@@ -8,7 +8,7 @@ export const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
     return (
       <textarea
         className={cn(
-          "flex min-h-[120px] w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 placeholder:text-slate-400 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 disabled:cursor-not-allowed disabled:opacity-50",
+          "flex min-h-[120px] w-full rounded-lg border border-zinc-300 bg-white px-3 py-2 text-sm text-zinc-900 placeholder:text-zinc-400 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 disabled:cursor-not-allowed disabled:opacity-50",
           className,
         )}
         ref={ref}