fix: neutralize case card tag color

src/pages/project_manager_xy/resource-booking/index.jsx

@@ -339,7 +339,7 @@ function CaseCard({ item, onOpen }) {
           <div className="flex min-w-0 flex-wrap gap-2">
             <Chip color="accent" size="sm" variant="soft">{item.category}</Chip>
             {item.caseLevel ? <Chip color="warning" size="sm" variant="soft">{item.caseLevel}</Chip> : null}
-            {item.tag ? <Chip color="success" size="sm" variant="soft">{item.tag}</Chip> : null}
+            {item.tag ? <Chip color="default" size="sm" variant="soft">{item.tag}</Chip> : null}
           </div>
           <ItemCard.Title className="w-full whitespace-normal break-words">
             {item.label || '未命名案例'}