test(pdf-viewer): consolidate spec.ts into test.ts — absorb page-counter test, delete spec

Absorbs the three tests from PdfViewer.svelte.spec.ts (nav buttons, zoom
controls, page counter) into the loaded-state describe in test.ts, then
deletes the now-empty spec file. One spec file per component.

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

frontend/src/lib/document/viewer/PdfViewer.svelte.spec.ts

@@ -1,56 +0,0 @@
-import { vi, describe, it, expect, afterEach } from 'vitest';
-import { cleanup, render } from 'vitest-browser-svelte';
-import { page } from 'vitest/browser';
-import type { LibLoader } from '$lib/document/viewer/usePdfRenderer.svelte';
-import PdfViewer from './PdfViewer.svelte';
-
-afterEach(cleanup);
-
-function makeFakePdfjsLib() {
-	class TextLayerMock {
-		render() {
-			return Promise.resolve();
-		}
-		cancel() {}
-	}
-
-	return {
-		GlobalWorkerOptions: { workerSrc: '' },
-		getDocument: vi.fn().mockReturnValue({
-			promise: Promise.resolve({
-				numPages: 2,
-				getPage: vi.fn().mockResolvedValue({
-					getViewport: vi.fn().mockReturnValue({ width: 595, height: 842 }),
-					render: vi.fn().mockReturnValue({ promise: Promise.resolve() }),
-					streamTextContent: vi.fn().mockReturnValue(new ReadableStream())
-				})
-			})
-		}),
-		TextLayer: TextLayerMock
-	} as unknown as typeof import('pdfjs-dist');
-}
-
-function makeFakeLibLoader(): LibLoader {
-	const fakePdfjs = makeFakePdfjsLib();
-	return vi.fn().mockResolvedValue([fakePdfjs, { default: '' }] as const);
-}
-
-describe('PdfViewer', () => {
-	it('shows previous and next page navigation buttons', async () => {
-		render(PdfViewer, { url: '/api/documents/test-id/file', libLoader: makeFakeLibLoader() });
-		await expect.element(page.getByRole('button', { name: /zurück/i })).toBeInTheDocument();
-		await expect.element(page.getByRole('button', { name: /weiter/i })).toBeInTheDocument();
-	});
-
-	it('shows zoom controls', async () => {
-		render(PdfViewer, { url: '/api/documents/test-id/file', libLoader: makeFakeLibLoader() });
-		await expect.element(page.getByRole('button', { name: /vergrößern/i })).toBeInTheDocument();
-		await expect.element(page.getByRole('button', { name: /verkleinern/i })).toBeInTheDocument();
-	});
-
-	it('displays the page counter once the PDF has loaded', async () => {
-		render(PdfViewer, { url: '/api/documents/test-id/file', libLoader: makeFakeLibLoader() });
-		// Fake loader resolves synchronously, so "1 / 2" should appear quickly
-		await expect.element(page.getByText(/1\s*\/\s*2/)).toBeInTheDocument();
-	});
-});