fix(appointments): preload clinic + keep saved time on edit

The appointment-edit form opened with clinic/time blank even for
well-formed appointments because the pipeline never carried clinicId
end-to-end. Four-layer audit + fix:

1. APPOINTMENTS_QUERY now fetches clinicId + clinic { id clinicName }
   + doctor.fullName (was only doctor.id).
2. transformAppointments populates real clinicId + clinicName from the
   relation instead of faking clinicName=department.
3. Appointment type gets clinicId: string | null.
4. context-panel passes clinicId through to AppointmentForm's
   existingAppointment prop; form initial-states clinic from it.

Also on edit: if the saved timeSlot isn't in the fresh slot list
(past-slot filter, schedule change, clinic mismatch) we inject it as
"HH:MM (current)" so the dropdown displays the existing value instead
of looking cleared.

Historical appointments with clinicId=null on the platform still fall
through to the auto-select-from-slot logic; a maint backfill for those
is a separate task.

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

src/lib/transforms.ts

@@ -158,22 +158,31 @@ export function transformCalls(data: any): Call[] {
 }
 
 export function transformAppointments(data: any): Appointment[] {
-    return extractEdges(data, 'appointments').map((n) => ({
-        id: n.id,
-        createdAt: n.createdAt,
-        scheduledAt: n.scheduledAt,
-        durationMinutes: n.durationMin ?? 30,
-        appointmentType: n.appointmentType,
-        appointmentStatus: n.status,
-        doctorName: n.doctorName,
-        doctorId: n.doctor?.id ?? null,
-        department: n.department,
-        reasonForVisit: n.reasonForVisit,
-        patientId: n.patient?.id ?? null,
-        patientName: n.patient?.fullName ? `${n.patient.fullName.firstName} ${n.patient.fullName.lastName}`.trim() : null,
-        patientPhone: n.patient?.phones?.primaryPhoneNumber ?? null,
-        clinicName: n.department ?? null,
-    }));
+    return extractEdges(data, 'appointments').map((n) => {
+        // Doctor name: prefer the relation's fullName (authoritative — pulled
+        // from the Doctor entity). Fall back to the denormalized doctorName
+        // field for legacy rows that predate the doctor relation being fetched.
+        const doctorFullName = n.doctor?.fullName
+            ? `${n.doctor.fullName.firstName ?? ''} ${n.doctor.fullName.lastName ?? ''}`.trim()
+            : '';
+        return {
+            id: n.id,
+            createdAt: n.createdAt,
+            scheduledAt: n.scheduledAt,
+            durationMinutes: n.durationMin ?? 30,
+            appointmentType: n.appointmentType,
+            appointmentStatus: n.status,
+            doctorName: doctorFullName || n.doctorName || null,
+            doctorId: n.doctor?.id ?? null,
+            department: n.department,
+            reasonForVisit: n.reasonForVisit,
+            patientId: n.patient?.id ?? null,
+            patientName: n.patient?.fullName ? `${n.patient.fullName.firstName} ${n.patient.fullName.lastName}`.trim() : null,
+            patientPhone: n.patient?.phones?.primaryPhoneNumber ?? null,
+            clinicId: n.clinicId ?? n.clinic?.id ?? null,
+            clinicName: n.clinic?.clinicName ?? null,
+        };
+    });
 }
 
 export function transformPatients(data: any): Patient[] {