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/dropdown-menu.tsx

@@ -13,7 +13,7 @@ export const DropdownMenuContent = React.forwardRef<
       ref={ref}
       sideOffset={sideOffset}
       className={cn(
-        "z-50 min-w-[12rem] overflow-hidden rounded-xl border border-slate-200 bg-white p-1 text-slate-900 shadow-md",
+        "z-50 min-w-[12rem] overflow-hidden rounded-xl border border-zinc-200 bg-white p-1 text-zinc-900 shadow-md",
         className,
       )}
       {...props}
@@ -30,7 +30,7 @@ export const DropdownMenuItem = React.forwardRef<
   <DropdownMenuPrimitive.Item
     ref={ref}
     className={cn(
-      "flex cursor-default select-none items-center rounded-lg px-3 py-2 text-sm outline-none focus:bg-slate-100 data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      "flex cursor-default select-none items-center rounded-lg px-3 py-2 text-sm outline-none focus:bg-zinc-100 data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
       className,
     )}
     {...props}
@@ -45,7 +45,7 @@ export const DropdownMenuSeparator = React.forwardRef<
 >(({ className, ...props }, ref) => (
   <DropdownMenuPrimitive.Separator
     ref={ref}
-    className={cn("-mx-1 my-1 h-px bg-slate-200", className)}
+    className={cn("-mx-1 my-1 h-px bg-zinc-200", className)}
     {...props}
   />
 ));