fix: typage comment insert card_responses

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

backend/src/modules/cards/cards.service.ts

@@ -204,14 +204,12 @@ export class CardsService {
       throw new BadRequestException('Motivation obligatoire en cas de refus');
     }
 
-    await this.responsesRepo.save(
-      this.responsesRepo.create({
-        id_card: card.id,
-        id_utilisateur: userId,
-        action: dto.action,
-        comment: dto.comment?.trim(),
-      }),
-    );
+    await this.responsesRepo.insert({
+      id_card: card.id,
+      id_utilisateur: userId,
+      action: dto.action,
+      comment: dto.comment?.trim() || undefined,
+    });
 
     if (card.id_absence) {
       if (dto.action === CardResponseActionType.ACCEPT || dto.action === CardResponseActionType.ACK) {