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/components/dashboard/kpi-cards.tsx

@@ -80,7 +80,8 @@ export const DashboardKpi = ({ calls, leads }: DashboardKpiProps) => {
     const leadsWithResponse = leads.filter((l) => l.createdAt && l.firstContactedAt);
     const avgResponseTime = leadsWithResponse.length > 0
         ? Math.round(leadsWithResponse.reduce((sum, l) => {
-            return sum + (new Date(l.firstContactedAt!).getTime() - new Date(l.createdAt!).getTime()) / 60000;
+            const diff = Math.abs(new Date(l.firstContactedAt!).getTime() - new Date(l.createdAt!).getTime()) / 60000;
+            return sum + diff;
         }, 0) / leadsWithResponse.length)
         : null;