fix: pinned header/chat input, numpad dialler, caller matching, appointment FK

- AppShell: h-screen + overflow-hidden for pinned header
- AI chat: input pinned to bottom, messages scroll independently
- Dialler: numpad grid (1-9,*,0,#) replaces text input
- Inbound calls: don't fall back to previously selected lead
- Appointment: use lead.patientId instead of leadId for FK
- Added .env.production for consistent builds

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

src/components/call-desk/active-call-card.tsx

@@ -226,6 +226,7 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
                         callerNumber={callerPhone}
                         leadName={fullName || null}
                         leadId={lead?.id ?? null}
+                        patientId={(lead as any)?.patientId ?? null}
                         onSaved={handleAppointmentSaved}
                     />
                 </>
@@ -340,6 +341,7 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
                     callerNumber={callerPhone}
                     leadName={fullName || null}
                     leadId={lead?.id ?? null}
+                    patientId={(lead as any)?.patientId ?? null}
                     onSaved={handleAppointmentSaved}
                 />