feat: cross-column DnD, fix context menu, rename task types to 실행과제/기반업무

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

frontend/src/components/dashboard/TaskCard.tsx

@@ -170,6 +170,7 @@ export function TaskCard({
         style={dragStyle}
         {...dragAttributes}
         {...dragListeners}
+        data-task-card="true"
         className="mb-3 cursor-grab select-none overflow-hidden rounded-[1.35rem] border border-white/80 bg-white px-5 py-4 shadow-[0_10px_28px_rgba(15,23,42,0.08)] ring-1 ring-slate-200/60 transition-all hover:-translate-y-0.5 hover:shadow-[0_18px_34px_rgba(15,23,42,0.14)] active:cursor-grabbing"
         onPointerDown={(e) => {
           // 우클릭(button !== 0)을 dnd-kit에 전달하지 않음