feat: appointments page, data refresh on login, multi-agent spec + plan

- Appointment Master page with status tabs, search, PhoneActionCell
- Login calls DataProvider.refresh() to load data after auth
- Sidebar: appointments nav for CC agents + executives
- Multi-agent SIP + lockout spec and implementation plan

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/shared/global-search.tsx

@@ -102,7 +102,7 @@ export const GlobalSearch = ({ onSelectResult }: GlobalSearchProps) => {
                         id: a.id,
                         type: 'appointment',
                         title: a.doctorName ?? 'Appointment',
-                        subtitle: [a.department, date, a.appointmentStatus].filter(Boolean).join(' · '),
+                        subtitle: [a.department, date, a.status].filter(Boolean).join(' · '),
                     });
                 }