refactor(transcription): replace window.confirm with ConfirmService in TranscriptionBlock

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

frontend/src/lib/components/TranscriptionBlock.svelte

@@ -1,7 +1,10 @@
 <script lang="ts">
 import { m } from '$lib/paraglide/messages.js';
+import { getConfirmService } from '$lib/services/confirm.svelte.js';
 import CommentThread from './CommentThread.svelte';
 
+const { confirm } = getConfirmService();
+
 type SaveState = 'idle' | 'saving' | 'saved' | 'fading' | 'error';
 
 type Props = {
@@ -90,10 +93,12 @@ function handleInput(event: Event) {
 	onTextChange(target.value);
 }
 
-function handleDelete() {
-	if (confirm(m.transcription_block_delete_confirm())) {
-		onDeleteClick();
-	}
+async function handleDelete() {
+	const confirmed = await confirm({
+		title: m.transcription_block_delete_confirm(),
+		destructive: true
+	});
+	if (confirmed) onDeleteClick();
 }
 
 function handleTextareaMouseUp() {

frontend/src/lib/components/TranscriptionBlock.svelte.spec.ts

@@ -1,25 +1,32 @@
 import { describe, it, expect, vi, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page } from 'vitest/browser';
-import TranscriptionBlock from './TranscriptionBlock.svelte';
+import TranscriptionBlockHost from './TranscriptionBlock.test-host.svelte';
+import type { ConfirmService } from '$lib/services/confirm.svelte.js';
 
 afterEach(cleanup);
 
+const BASE_PROPS = {
+	blockId: 'block-1',
+	documentId: 'doc-1',
+	blockNumber: 3,
+	text: 'Liebe Mutter,',
+	label: null,
+	active: false,
+	saveState: 'idle' as const,
+	canComment: true,
+	currentUserId: 'user-1',
+	onTextChange: vi.fn(),
+	onFocus: vi.fn(),
+	onDeleteClick: vi.fn(),
+	onRetry: vi.fn()
+};
+
+// Renders TranscriptionBlock via the host, which provides ConfirmService context.
 function renderBlock(overrides: Record<string, unknown> = {}) {
-	return render(TranscriptionBlock, {
-		blockId: 'block-1',
-		documentId: 'doc-1',
-		blockNumber: 3,
-		text: 'Liebe Mutter,',
-		label: null,
-		active: false,
-		saveState: 'idle' as const,
-		canComment: true,
-		currentUserId: 'user-1',
-		onTextChange: vi.fn(),
-		onFocus: vi.fn(),
-		onDeleteClick: vi.fn(),
-		onRetry: vi.fn(),
+	return render(TranscriptionBlockHost, {
+		...BASE_PROPS,
+		onServiceReady: () => {},
 		...overrides
 	});
 }
@@ -162,29 +169,57 @@ describe('TranscriptionBlock — reorder controls', () => {
 
 // ─── Delete confirmation ──────────────────────────────────────────────────────
 
-describe('TranscriptionBlock — delete confirmation', () => {
-	it('does not call onDeleteClick when user cancels confirm dialog', async () => {
-		const onDeleteClick = vi.fn();
-		vi.spyOn(window, 'confirm').mockReturnValue(false);
-		renderBlock({ onDeleteClick });
+function renderBlockWithService(overrides: Record<string, unknown> = {}) {
+	let service!: ConfirmService;
+	render(TranscriptionBlockHost, {
+		blockId: 'block-1',
+		documentId: 'doc-1',
+		blockNumber: 3,
+		text: 'Liebe Mutter,',
+		label: null,
+		active: false,
+		saveState: 'idle' as const,
+		canComment: true,
+		currentUserId: 'user-1',
+		onTextChange: vi.fn(),
+		onFocus: vi.fn(),
+		onDeleteClick: vi.fn(),
+		onRetry: vi.fn(),
+		onServiceReady: (s: ConfirmService) => {
+			service = s;
+		},
+		...overrides
+	});
+	return { service };
+}
 
-		const deleteBtn = page.getByRole('button', { name: 'Löschen' });
-		await deleteBtn.click();
+describe('TranscriptionBlock — delete confirmation', () => {
+	it('does not call onDeleteClick when user cancels via confirm service', async () => {
+		const onDeleteClick = vi.fn();
+		const { service } = renderBlockWithService({ onDeleteClick });
+
+		// Use native DOM click so the async handler starts but yields at the await,
+		// letting the test observe service.options and settle the promise.
+		const deleteBtn = document.querySelector('button[aria-label="Löschen"]') as HTMLButtonElement;
+		deleteBtn.click();
+		await vi.waitFor(() => expect(service.options).not.toBeNull());
+		service.settle(false);
+		await vi.waitFor(() => expect(service.options).toBeNull());
 
 		expect(onDeleteClick).not.toHaveBeenCalled();
-		vi.restoreAllMocks();
 	});
 
-	it('calls onDeleteClick when user confirms deletion', async () => {
+	it('calls onDeleteClick when user confirms via confirm service', async () => {
 		const onDeleteClick = vi.fn();
-		vi.spyOn(window, 'confirm').mockReturnValue(true);
-		renderBlock({ onDeleteClick });
+		const { service } = renderBlockWithService({ onDeleteClick });
 
-		const deleteBtn = page.getByRole('button', { name: 'Löschen' });
-		await deleteBtn.click();
+		const deleteBtn = document.querySelector('button[aria-label="Löschen"]') as HTMLButtonElement;
+		deleteBtn.click();
+		await vi.waitFor(() => expect(service.options).not.toBeNull());
+		service.settle(true);
+		await vi.waitFor(() => expect(service.options).toBeNull());
 
 		expect(onDeleteClick).toHaveBeenCalledOnce();
-		vi.restoreAllMocks();
 	});
 });
 

frontend/src/lib/components/TranscriptionBlock.test-host.svelte

@@ -0,0 +1,36 @@
+<script lang="ts">
+import { provideConfirmService, type ConfirmService } from '$lib/services/confirm.svelte.js';
+import TranscriptionBlock from './TranscriptionBlock.svelte';
+
+type BlockProps = {
+	blockId: string;
+	documentId: string;
+	blockNumber: number;
+	text: string;
+	label: string | null;
+	active: boolean;
+	saveState: 'idle' | 'saving' | 'saved' | 'fading' | 'error';
+	canComment: boolean;
+	currentUserId: string | null;
+	onTextChange: (text: string) => void;
+	onFocus: () => void;
+	onDeleteClick: () => void;
+	onRetry: () => void;
+	onMoveUp?: () => void;
+	onMoveDown?: () => void;
+	isFirst?: boolean;
+	isLast?: boolean;
+};
+
+let {
+	onServiceReady,
+	...blockProps
+}: BlockProps & {
+	onServiceReady: (s: ConfirmService) => void;
+} = $props();
+
+const service = provideConfirmService();
+onServiceReady(service);
+</script>
+
+<TranscriptionBlock {...blockProps} />