feat: post-call workflow — disposition, appointment booking, follow-up creation

ActiveCallCard now handles the full post-call flow:
- Call ends → Disposition form appears (6 options + notes)
- "Appointment Booked" → Opens appointment booking slideout
- "Follow-up Needed" → Auto-creates follow-up in platform
- Other dispositions → Logs call and returns to worklist
- "Book Appt" button available during active call too
- Creates Call record in platform on disposition submit
- Removed auto-reset to idle (ActiveCallCard manages lifecycle)
- "Back to Worklist" resets SIP state via Jotai atoms

Also fixes:
- All 7 GraphQL queries corrected (LINKS subfields, field renames)
- Campaign edit button moved to bottom-right
- Avg Response Time uses Math.abs for seed data edge case

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

src/pages/call-desk.tsx

@@ -21,7 +21,7 @@ export const CallDeskPage = () => {
     const [selectedLead, setSelectedLead] = useState<WorklistLead | null>(null);
     const [contextOpen, setContextOpen] = useState(true);
 
-    const isInCall = callState === 'ringing-in' || callState === 'ringing-out' || callState === 'active';
+    const isInCall = callState === 'ringing-in' || callState === 'ringing-out' || callState === 'active' || callState === 'ended' || callState === 'failed';
 
     const callerLead = callerNumber
         ? marketingLeads.find((l) => l.contactPhone?.[0]?.number?.endsWith(callerNumber) || callerNumber.endsWith(l.contactPhone?.[0]?.number ?? '---'))