feat: feedback edit/delete buttons and author name on edit

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

backend/src/routes/details.ts

@@ -44,7 +44,7 @@ router.post('/:taskId', async (req, res, next) => {
 // PATCH /api/details/item/:id
 router.patch('/item/:id', async (req, res, next) => {
   try {
-    const { content } = req.body as Record<string, string>;
+    const { content, authorName } = req.body as Record<string, string>;
     if (!content?.toString().trim()) throw new AppError(400, '피드백 내용은 필수입니다.');
 
     const existing = await prisma.taskDetail.findUnique({ where: { id: req.params.id } });
@@ -52,7 +52,10 @@ router.patch('/item/:id', async (req, res, next) => {
 
     const detail = await prisma.taskDetail.update({
       where: { id: req.params.id },
-      data: { content: content.toString().trim() },
+      data: {
+        content: content.toString().trim(),
+        ...(authorName !== undefined && { authorName: authorName?.toString().trim() || null }),
+      },
       include: { author: { select: { id: true, name: true } } },
     });