docs(rtm): trace #842 timeline-curator-affordances + i18n parity guard

Add REQ-001..011 rows for the timeline-curator-affordances feature (all
Done) and a messages.spec parity guard pinning timeline_add_event +
person_add_event across de/en/es. REQ-010/011 cite the existing #781
new-event route + its 403 guard test (no new production code).

Refs #842
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/messages.spec.ts

@@ -123,4 +123,14 @@ describe('message key parity', () => {
 		expect(en.timeline_filter_trigger_active).toContain('{count}');
 		expect(es.timeline_filter_trigger_active).toContain('{count}');
 	});
+
+	// #842: the two curator-affordance CTA labels (Zeitstrahl header + person page)
+	// are Paraglide keys present in every locale; the edit pencils reuse btn_edit.
+	it('curator-affordance CTA keys are present in all locales (#842)', () => {
+		for (const key of ['timeline_add_event', 'person_add_event']) {
+			expect(de, `missing key in de: ${key}`).toHaveProperty(key);
+			expect(en, `missing key in en: ${key}`).toHaveProperty(key);
+			expect(es, `missing key in es: ${key}`).toHaveProperty(key);
+		}
+	});
 });