feat(20-03): add transcript UI — modal, list, expand/collapse, delete

TranscriptModal.tsx: new component — call_date input, optional title,
content textarea (min-h-48). Calls addTranscript server action.

LeadDetail.tsx: adds transcripts prop (ClientTranscript[]), TranscriptModal
button in header, "Transcript Call" Card after Storico Attività with
call_date formatted in Italian, 3-line preview with expand/collapse toggle,
Elimina button via deleteTranscript. border-l-4 border-purple-300.

page.tsx: getTranscripts(id) added to Promise.all, transcripts prop
passed to LeadDetail. Build: clean, TypeScript: no errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/admin/leads/[id]/page.tsx

@@ -1,5 +1,5 @@
 import { notFound } from "next/navigation";
-import { getActivityLog, getUpcomingReminders } from "@/lib/lead-service";
+import { getActivityLog, getUpcomingReminders, getTranscripts } from "@/lib/lead-service";
 import { getLeadsWithTags, getLeadFieldOptions } from "@/lib/admin-queries";
 import { LeadDetail } from "@/components/admin/leads/LeadDetail";
 
@@ -17,8 +17,11 @@ export default async function LeadDetailPage({ params }: { params: Promise<{ id:
     notFound();
   }
 
-  const activities = await getActivityLog(id);
-  const reminders = await getUpcomingReminders(id);
+  const [activities, reminders, transcripts] = await Promise.all([
+    getActivityLog(id),
+    getUpcomingReminders(id),
+    getTranscripts(id),
+  ]);
 
   return (
     <LeadDetail
@@ -27,6 +30,7 @@ export default async function LeadDetailPage({ params }: { params: Promise<{ id:
       reminders={reminders}
       tags={lead.tags}
       tagOptions={options.tags}
+      transcripts={transcripts}
     />
   );
 }