feat: show max-hold session countdown

frontend/src/lib/types.ts

@@ -237,6 +237,8 @@ export interface PaperTrade {
   close_reason: 'time' | 'trailing' | 'stop' | 'target' | 'manual' | null;
   trailing_stop: number | null;
   trailing_distance_pct: number | null;
+  sessions_held: number | null;
+  sessions_remaining: number | null;
 }
 
 export interface ExitPolicy {