test(bulk-upload): add cancel-path coverage for discard-all confirm dialog

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/components/document/BulkDocumentEditLayout.svelte.spec.ts

@@ -3,6 +3,7 @@ import { goto } from '$app/navigation';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page, userEvent } from 'vitest/browser';
 import BulkDocumentEditLayout from './BulkDocumentEditLayout.svelte';
+import { createConfirmService, CONFIRM_KEY } from '$lib/services/confirm.svelte.js';
 
 vi.mock('$app/navigation', () => ({ goto: vi.fn() }));
 
@@ -289,6 +290,29 @@ describe('BulkDocumentEditLayout', () => {
 		expect(mockFetch).toHaveBeenCalledTimes(1);
 	});
 
+	it('discard-all does not clear files when the user cancels the confirm dialog', async () => {
+		const service = createConfirmService();
+		const { container } = render(BulkDocumentEditLayout, {
+			context: new Map([[CONFIRM_KEY, service]])
+		});
+		await addFilesViaInput(container, [makeFile('a.pdf'), makeFile('b.pdf')]);
+
+		const discardBtn = container.querySelector(
+			'button[data-testid="discard-all-btn"]'
+		) as HTMLButtonElement;
+		discardBtn.click();
+
+		// The confirm dialog should open (service.options not null)
+		await vi.waitFor(() => expect(service.options).not.toBeNull(), { timeout: 1000 });
+
+		// Cancel — files should remain
+		service.settle(false);
+		await vi.waitFor(
+			() => expect(container.querySelector('[data-testid="file-switcher-strip"]')).not.toBeNull(),
+			{ timeout: 1000 }
+		);
+	});
+
 	it('discard-all resets to N=0 state and shows drop zone', async () => {
 		const { container } = render(BulkDocumentEditLayout, {});
 		await addFilesViaInput(container, [makeFile('a.pdf'), makeFile('b.pdf')]);