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/components/call-desk/enquiry-form.tsx

@@ -287,7 +287,15 @@ export const EnquiryForm = ({ isOpen, onOpenChange, callerPhone, leadName, leadI
                     <Checkbox isSelected={followUpNeeded} onChange={setFollowUpNeeded} label="Follow-up Needed" />
                     {followUpNeeded && (
                         <div className="flex-1 max-w-[180px]">
-                            <Input type="date" value={followUpDate} onChange={setFollowUpDate} isRequired aria-label="Follow-up Date" />
+                            <input
+                                type="date"
+                                value={followUpDate}
+                                min={new Date().toISOString().split('T')[0]}
+                                onChange={(e) => setFollowUpDate(e.target.value)}
+                                required
+                                aria-label="Follow-up Date"
+                                className="w-full rounded-lg border border-primary bg-primary px-3 py-2 text-sm text-primary outline-none focus:border-brand-primary"
+                            />
                         </div>
                     )}
                 </div>