fix(tests): fix 3 pre-existing vitest-browser spec failures

Three distinct root causes:

1. hilfe/transkription: Wikipedia link test was checking .textContent but
   the accessible text had moved to aria-label in a prior commit.

2. documents/[id]/edit: vi.spyOn on a Svelte 5 compiled .svelte.ts service
   object does not reliably track calls in vitest-browser mode; replaced
   with a plain closure-based mock.

3. GeschichteEditor: TipTap's onMount steals focus and its ProseMirror
   view interferes with Playwright CDP event dispatch. Three workarounds:
   - blur: dispatchEvent(new FocusEvent('blur')) bypasses focus-state check
   - save buttons: dispatchEvent(new MouseEvent('click')) from in-browser JS
     context reliably triggers Svelte 5 onclick vs. Playwright CDP click
   - trailing-space fill: input.value + dispatchEvent('input') works where
     userEvent.fill('value ') silently fails to update bind:value

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

frontend/src/routes/documents/[id]/edit/page.svelte.spec.ts

@@ -1,7 +1,12 @@
 import { vi, describe, it, expect, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page } from 'vitest/browser';
-import { createConfirmService, CONFIRM_KEY } from '$lib/shared/services/confirm.svelte.js';
+import {
+	createConfirmService,
+	CONFIRM_KEY,
+	type ConfirmOptions,
+	type ConfirmService
+} from '$lib/shared/services/confirm.svelte.js';
 import EditPage from './+page.svelte';
 
 afterEach(cleanup);
@@ -32,17 +37,34 @@ describe('Edit page — delete button', () => {
 	});
 
 	it('opens a confirm dialog when the delete button is clicked', async () => {
-		const service = createConfirmService();
+		// vi.spyOn on a Svelte 5 compiled service object does not reliably track calls in
+		// vitest-browser mode (signal scoping), so we use a plain mock object instead.
+		let capturedOptions: ConfirmOptions | null = null;
+		let settleRef: ((value: boolean) => void) | null = null;
+		const mockService: ConfirmService = {
+			confirm(opts) {
+				capturedOptions = opts;
+				return new Promise<boolean>((resolve) => {
+					settleRef = resolve;
+				});
+			},
+			get options(): ConfirmOptions | null {
+				return null;
+			},
+			settle(value) {
+				settleRef?.(value);
+			}
+		};
+
 		render(EditPage, {
 			props: { data: { document: makeDocument() }, form: null },
-			context: new Map([[CONFIRM_KEY, service]])
+			context: new Map([[CONFIRM_KEY, mockService]])
 		});
 
 		await page.getByRole('button', { name: /löschen/i }).click();
-		// The confirm service should have received an options object (dialog is open)
-		expect(service.options).not.toBeNull();
-		expect(service.options?.destructive).toBe(true);
-		service.settle(false);
+		await vi.waitFor(() => expect(capturedOptions).not.toBeNull());
+		expect(capturedOptions).toMatchObject({ destructive: true });
+		settleRef?.(false);
 	});
 
 	it('submits the delete form when the user confirms', async () => {

frontend/src/routes/hilfe/transkription/page.svelte.spec.ts

@@ -25,9 +25,9 @@ describe('Richtlinien page — structure', () => {
 		await expect.element(wikiLink).toHaveAttribute('target', '_blank');
 		await expect.element(wikiLink).toHaveAttribute('rel', 'noopener noreferrer');
 		await expect.element(wikiLink).toHaveAttribute('referrerpolicy', 'no-referrer');
-		// visible annotation (not sr-only)
+		// icon communicates "opens new tab" visually; aria-label carries the text for a11y
 		const link = document.querySelector('a[href*="wikipedia"]') as HTMLAnchorElement;
-		expect(link.textContent).toContain('öffnet in neuem Tab');
+		expect(link.getAttribute('aria-label')).toContain('öffnet in neuem Tab');
 	});
 
 	it('renders Regeln h2 section', async () => {