feat: info icon on all PageHeader pages + Call Desk header restyled

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

src/pages/appointments-v2.tsx

@@ -555,6 +555,7 @@ export const AppointmentsPageV2 = () => {
             <PageHeader
                 title="Appointments"
                 badge={filtered.length}
+                infoText="All scheduled, completed, cancelled, and rescheduled appointments. Click the eye icon to view details or reschedule."
                 controls={
                     <div className="w-56">
                         <Input