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/providers/sip-provider.tsx

@@ -43,6 +43,8 @@ export const SipProvider = ({ children }: PropsWithChildren) => {
     const setCallUcid = useSetAtom(sipCallUcidAtom);
     const setCallDuration = useSetAtom(sipCallDurationAtom);
     const setCallStartTime = useSetAtom(sipCallStartTimeAtom);
+    const setIsMutedGlobal = useSetAtom(sipIsMutedAtom);
+    const setIsOnHoldGlobal = useSetAtom(sipIsOnHoldAtom);
 
     // Register Jotai setters so the singleton SIP manager can update atoms
     useEffect(() => {
@@ -51,8 +53,10 @@ export const SipProvider = ({ children }: PropsWithChildren) => {
             setCallState,
             setCallerNumber,
             setCallUcid,
+            setIsMuted: setIsMutedGlobal,
+            setIsOnHold: setIsOnHoldGlobal,
         });
-    }, [setConnectionStatus, setCallState, setCallerNumber, setCallUcid]);
+    }, [setConnectionStatus, setCallState, setCallerNumber, setCallUcid, setIsMutedGlobal, setIsOnHoldGlobal]);
 
     // Auto-connect SIP on mount — only if Agent entity has SIP config
     useEffect(() => {