test(e2e): add transcribe-coach, richtlinien, and help-popover E2E specs; reducedMotion global default

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

frontend/e2e/helpers/upload-empty-document.ts

@@ -0,0 +1,10 @@
+import type { APIRequestContext } from '@playwright/test';
+
+export async function createEmptyDocument(request: APIRequestContext): Promise<string> {
+	const res = await request.post('/api/documents', {
+		multipart: { title: 'E2E Transcribe Coach Test' }
+	});
+	if (!res.ok()) throw new Error(`Create document failed: ${res.status()}`);
+	const doc = await res.json();
+	return doc.id as string;
+}