feat: add cashbox export model and FileDownloadService

myteamwallet_frontend_modern/src/app/models/cashbox-export.model.ts

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+import { RecurringTransactionInterval } from './recurring-transaction.model';
+
+export type CashboxExportFormat = 'csv' | 'pdf';
+
+export interface CashboxExportSubscription {
+  recipients: string[];
+  interval: RecurringTransactionInterval;
+  active: boolean;
+  nextRunDate: string | null;
+}
+
+export interface UpdateCashboxExportSubscription {
+  recipients: string[];
+  interval: RecurringTransactionInterval;
+  active: boolean;
+}

myteamwallet_frontend_modern/src/app/shared/file-download/file-download.service.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { FileDownloadService } from './file-download.service';
+
+describe('FileDownloadService', () => {
+  let service: FileDownloadService;
+  let clickSpy: ReturnType<typeof vi.fn>;
+  let createObjectURLSpy: ReturnType<typeof vi.fn>;
+  let revokeObjectURLSpy: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    service = TestBed.inject(FileDownloadService);
+    clickSpy = vi.fn();
+    createObjectURLSpy = vi.fn(() => 'blob:mock-url');
+    revokeObjectURLSpy = vi.fn();
+    vi.spyOn(URL, 'createObjectURL').mockImplementation(createObjectURLSpy as (obj: Blob | MediaSource) => string);
+    vi.spyOn(URL, 'revokeObjectURL').mockImplementation(revokeObjectURLSpy as (url: string) => void);
+    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(clickSpy as () => void);
+  });
+
+  it('creates an object URL, clicks a temporary anchor with the given filename, and revokes the URL', () => {
+    const blob = new Blob(['content'], { type: 'text/csv' });
+
+    service.save(blob, 'kassenbuch.csv');
+
+    expect(createObjectURLSpy).toHaveBeenCalledWith(blob);
+    expect(clickSpy).toHaveBeenCalledTimes(1);
+    expect(revokeObjectURLSpy).toHaveBeenCalledWith('blob:mock-url');
+  });
+});

myteamwallet_frontend_modern/src/app/shared/file-download/file-download.service.ts

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+import { Injectable } from '@angular/core';
+
+@Injectable({ providedIn: 'root' })
+export class FileDownloadService {
+  save(blob: Blob, filename: string): void {
+    const url = URL.createObjectURL(blob);
+    const anchor = document.createElement('a');
+    anchor.href = url;
+    anchor.download = filename;
+    anchor.click();
+    URL.revokeObjectURL(url);
+  }
+}