fix: QA defects — phone format E.164, call history shows phone not Unknown

- appointment-form: normalize phone to +91XXXXXXXXXX before patient create
- appointment-form: use empty string not 'Unknown' for name fallback
- call-history: show formatted phone number instead of 'Unknown' when no lead

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

src/components/call-desk/appointment-form.tsx

@@ -264,13 +264,16 @@ export const AppointmentForm = ({
                 if (!resolvedPatientId && callerNumber) {
                     const trimmedName = patientName.trim();
                     const nameParts = {
-                        firstName: trimmedName.split(' ')[0] || 'Unknown',
+                        firstName: trimmedName.split(' ')[0] || '',
                         lastName: trimmedName.split(' ').slice(1).join(' ') || '',
                     };
+                    // Normalize phone to +91XXXXXXXXXX format
+                    const phoneDigits = callerNumber.replace(/\D/g, '').slice(-10);
+                    const phoneE164 = `+91${phoneDigits}`;
                     try {
                         const created = await apiClient.graphql<{ createPatient: { id: string } }>(
                             `mutation($data: PatientCreateInput!) { createPatient(data: $data) { id } }`,
-                            { data: { fullName: nameParts, phones: { primaryPhoneNumber: callerNumber }, patientType: 'NEW' } },
+                            { data: { fullName: nameParts, phones: { primaryPhoneNumber: phoneE164 }, patientType: 'NEW' } },
                         );
                         resolvedPatientId = created.createPatient.id;
                     } catch (err) {