resolve CR comments

Author: mkovalua

src/app/features/preprints/store/preprint-stepper/preprint-stepper.state.ts

@@ -313,7 +313,7 @@ export class PreprintStepperState {
         ctx.setState(
           patch({
             projectFiles: patch({
-              data: response.files,
+              data: response.data,
               isLoading: false,
             }),
           })

src/app/features/registries/store/handlers/files.handlers.ts

@@ -47,14 +47,14 @@ export class FilesHandlers {
 
     return this.filesService.getFilesWithoutFiltering(filesLink, page).pipe(
       tap((response) => {
-        const newData = page === 1 ? response.files : [...(state.files.data ?? []), ...response.files];
+        const newData = page === 1 ? response.data : [...(state.files.data ?? []), ...response.data];
 
         ctx.patchState({
           files: {
             data: newData,
             isLoading: false,
             error: null,
-            totalCount: response.meta?.total ?? 0,
+            totalCount: response.totalCount,
           },
         });
       }),

src/app/shared/services/files.service.ts

@@ -16,6 +16,7 @@ import {
   OsfFileRevision,
   PatchFileMetadata,
 } from '@osf/features/files/models';
+import { PaginatedData } from '@osf/shared/models/paginated-data.model';
 
 import { FileKind } from '../enums/file-kind.enum';
 import { AddonMapper } from '../mappers/addon.mapper';
@@ -85,13 +86,17 @@ export class FilesService {
       .pipe(map((response) => ({ files: FilesMapper.getFileFolders(response.data), meta: response.meta })));
   }
 
-  getFilesWithoutFiltering(filesLink: string, page = 1): Observable<{ files: FileModel[]; meta?: MetaJsonApi }> {
+  getFilesWithoutFiltering(filesLink: string, page = 1): Observable<PaginatedData<FileModel[]>> {
     const params: Record<string, string> = {
       page: page.toString(),
     };
-    return this.jsonApiService
-      .get<FilesResponseJsonApi>(filesLink, params)
-      .pipe(map((response) => ({ files: FilesMapper.getFiles(response.data), meta: response.meta })));
+    return this.jsonApiService.get<FilesResponseJsonApi>(filesLink, params).pipe(
+      map((response) => ({
+        data: FilesMapper.getFiles(response.data),
+        totalCount: response.meta.total,
+        pageSize: response.meta.per_page,
+      }))
+    );
   }
 
   uploadFile(