fix issues in core

core/media/application/use-cases/SelectAvatarUseCase.ts

@@ -46,14 +46,14 @@ export class SelectAvatarUseCase {
       const request = await this.avatarRepo.findById(input.requestId);
 
       if (!request) {
-        return Result.err({
+        return Result.err<void, SelectAvatarApplicationError>({
           code: 'REQUEST_NOT_FOUND',
           details: { message: 'Avatar generation request not found' },
         });
       }
 
       if (request.status !== 'completed') {
-        return Result.err({
+        return Result.err<void, SelectAvatarApplicationError>({
           code: 'REQUEST_NOT_COMPLETED',
           details: { message: 'Avatar generation is not completed yet' },
         });
@@ -62,7 +62,7 @@ export class SelectAvatarUseCase {
       request.selectAvatar(input.selectedIndex);
       await this.avatarRepo.save(request);
 
-      const selectedAvatarUrl = request.selectedAvatarUrl;
+      const selectedAvatarUrl = request.selectedAvatarUrl!;
 
       this.output.present({
         requestId: input.requestId,