feat: add weekly curriculum cover image upload and display

src/pages/curriculum/CurriculumPage.tsx

@@ -2,6 +2,7 @@ import { useEffect, useMemo, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
 import { CheckCircle2, CirclePlay, Clock3, FileCode2, FileText, Loader2, Map, Plus, RadioTower, Save, Target, Trash2, Upload, UsersRound, type LucideIcon } from 'lucide-react';
 import { ConfirmDialog } from '../../components/ConfirmDialog';
+import { WeekCoverEditor } from '../../components/WeekCoverEditor';
 import { PageHeader } from '../../components/PageHeader';
 import { useToast } from '../../components/ToastProvider';
 import { createInstructorCurriculumMap, deleteCurriculumReference, deleteInstructorCurriculumWeek, getInstructorCurriculum, updateInstructorCurriculum, uploadCurriculumExampleCode, uploadCurriculumReference, type CurriculumEnvironmentProfile, type CurriculumWeek, type InstructorCurriculumResponse } from '../../lib/curriculum';
@@ -106,6 +107,7 @@ function readEnvironmentModuleDockerImages(
 export function CurriculumPage({ session, selectedCourseId }: { session: AuthSession; selectedCourseId: string }) {
   const { showToast } = useToast();
   const [weeks, setWeeks] = useState<CurriculumWeek[]>([]);
+  const [coverOverrides, setCoverOverrides] = useState<Record<string, CurriculumWeek['detail']['coverImage']>>({});
   const [groups, setGroups] = useState<InstructorGroup[]>([]);
   const [selectedGroupId, setSelectedGroupId] = useState<string>('');
   const [activeWeek, setActiveWeek] = useState(1);
@@ -1398,6 +1400,11 @@ export function CurriculumPage({ session, selectedCourseId }: { session: AuthSes
                 )}
               </div>
             </section>
+            {selectedWeek && <WeekCoverEditor key={`${selectedCourseId}:${selectedWeek.week}`}
+              accessToken={session.accessToken} courseId={selectedCourseId} week={selectedWeek.week}
+              cover={coverOverrides[`${selectedCourseId}:${selectedWeek.week}`] !== undefined
+                ? coverOverrides[`${selectedCourseId}:${selectedWeek.week}`] ?? null : selectedWeek.detail.coverImage ?? null}
+              onChange={(cover) => setCoverOverrides((current) => ({ ...current, [`${selectedCourseId}:${selectedWeek.week}`]: cover }))} />}
             <label className="block">
               <h3 className="text-[15px] font-black text-[#111827]">제출 기준</h3>
               <textarea