feat(admin): show visit datetime and itemized cost breakdown in session details

DetailsStep now renders the appointment's visit date/time first (from
session_at, falling back to created_at) and an itemized cost table (visit +
each service line with its line total) plus the grand total. Extend
SessionCardData with session_at, services_total_rials, and per-line price
fields already returned by the session API.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/components/SessionServiceCard.tsx

@@ -12,8 +12,10 @@ export interface SessionPaymentEntry {
 
 export interface SessionCardData {
   uuid: string;
-  services?: Array<{ service_name?: string; name?: string }>;
+  services?: Array<{ service_name?: string; name?: string; line_total_rials?: number; price_rials?: number; quantity?: number }>;
   visit_price_rials?: number;
+  services_total_rials?: number;
+  session_at?: number | null;
   doctor_name?: string | null;
   final_price_rials?: number;
   patient_debt_rials?: number;