fix(messaging): truncate WhatsApp list section titles to 24 char limit

WhatsApp list messages have strict limits: section title max 24 chars,
row title max 24 chars. Long doctor names + dates in section titles
caused Gupshup to silently drop the list options.

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

src/messaging/messaging.service.ts

@@ -231,7 +231,7 @@ ${callerContext ? `\n${callerContext}` : ''}`;
                     if (!deptDocs.length) return { sent: false, message: `No doctors found in ${department}.` };
 
                     const sections: ListSection[] = [{
-                        title: department,
+                        title: department.substring(0, 24),
                         rows: deptDocs.slice(0, 10).map((d: any) => {
                             const docName = `Dr. ${d.fullName?.firstName ?? ''} ${d.fullName?.lastName ?? ''}`.trim();
                             const fee = d.consultationFeeNew?.amountMicros
@@ -299,11 +299,11 @@ ${callerContext ? `\n${callerContext}` : ''}`;
                     }
 
                     const sections: ListSection[] = [{
-                        title: `${doctorName} — ${targetDate}`,
+                        title: targetDate, // section title max 24 chars
                         rows: timeSlots.map((s) => ({
                             id: `slot:${doctorId}:${targetDate}T${s.time}:00`,
-                            title: s.time,
-                            description: s.clinic,
+                            title: s.time,              // row title max 24 chars
+                            description: s.clinic || undefined,
                         })),
                     }];
                     await provider.sendList(phone, `Available slots for ${doctorName}:`, 'View Slots', sections);

src/messaging/providers/gupshup.provider.ts

@@ -123,7 +123,7 @@ export class GupshupProvider extends MessagingProvider {
         params.append('message', message);
         params.append('src.name', this.appId);
 
-        this.logger.log(`[GUPSHUP] Sending to ${to}: ${message.substring(0, 100)}...`);
+        this.logger.log(`[GUPSHUP] Sending to ${to}: ${message.substring(0, 500)}`);
 
         const resp = await fetch(this.apiUrl, {
             method: 'POST',