feat: remove 관리현황 label, keep border separator

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

frontend/src/components/dashboard/DepartmentColumn.tsx

@@ -257,11 +257,6 @@ export function DepartmentColumn({ title: initialTitle, titleEn, subtitle: initi
           const routineTasks = orderedTasks.filter((t) => t.taskType === '상시업무');
           return (
             <div className="shrink-0 border-t border-gray-200">
-              <div className="flex items-center gap-2 px-4 py-1.5">
-                <div className="flex-1 border-t border-dashed border-gray-300" />
-                <span className="text-xs text-gray-400 font-bold shrink-0 tracking-wide">관리현황</span>
-                <div className="flex-1 border-t border-dashed border-gray-300" />
-              </div>
               <div className="px-4 pb-3 h-[200px] overflow-y-auto">
                 {routineTasks.length === 0 ? (
                   <div className="flex items-center justify-center h-full text-base text-gray-300">