fix: P1 call-desk defects batch

- Mute persists across calls: sip-manager's "ended/failed" branch now
  resets the Recoil sipIsMutedAtom + sipIsOnHoldAtom (previously only
  the SIP track was unmuted, leaving the UI icon + toggle logic in a
  muted state that the next call inherited).
- Telephony-unavailable dial pad: call-desk.tsx dial-pad "Call" button
  was missing an isRegistered check in its disabled prop, so it stayed
  clickable when SIP was down. Button now shows "Telephony unavailable"
  and is disabled.
- Past dates in Follow-up: enquiry-form's follow-up date input had no
  min constraint. Switched to a raw <input type="date"> with min set
  to today's ISO date.
- Returning-patient AI summary during call: ai-chat-panel now auto-fires
  a "give me a quick summary of <caller>" request whenever the caller's
  leadId changes (new incoming call). Clears prior chat state so each
  caller starts fresh.
- Remove Type column in Patients page (Badge import also pruned).

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

src/pages/patients.tsx

@@ -6,7 +6,6 @@ import { faIcon } from '@/lib/icon-wrapper';
 
 const SearchLg = faIcon(faMagnifyingGlass);
 import { Avatar } from '@/components/base/avatar/avatar';
-import { Badge } from '@/components/base/badges/badges';
 // Button removed — actions are icon-only now
 import { Input } from '@/components/base/input/input';
 import { Table, TableCard } from '@/components/application/table/table';
@@ -134,7 +133,6 @@ export const PatientsPage = () => {
                             <Table.Header>
                                 <Table.Head label="PATIENT" isRowHeader />
                                 <Table.Head label="CONTACT" />
-                                <Table.Head label="TYPE" />
                                 <Table.Head label="GENDER" />
                                 <Table.Head label="AGE" />
                                 <Table.Head label="ACTIONS" />
@@ -196,17 +194,6 @@ export const PatientsPage = () => {
                                                 </div>
                                             </Table.Cell>
 
-                                            {/* Type */}
-                                            <Table.Cell>
-                                                {patient.patientType ? (
-                                                    <Badge size="sm" color="gray">
-                                                        {patient.patientType}
-                                                    </Badge>
-                                                ) : (
-                                                    <span className="text-sm text-placeholder">—</span>
-                                                )}
-                                            </Table.Cell>
-
                                             {/* Gender */}
                                             <Table.Cell>
                                                 <span className="text-sm text-secondary">