feat(leads): implement reactive search for exhibitors and lead tracking

- Implemented V3-style reactive search (Local Cache -> Remote Revalidation) for exhibitors.
- Standardized search fields to 'name' for Exhibits and 'event_badge_full_name' for Lead Tracking.
- Refactored Leads UI with standardized search components and grid layout.
- Updated event routing to exclusively use string-based IDs (Triple-ID pattern).
- Hardened 'ae_EventSession' type definitions to handle null values from V3 API/Dexie.

src/lib/types/ae_types.ts

@@ -550,22 +550,22 @@ export interface ae_EventSession extends ae_BaseObj {
     event_session_id_random: string;
     event_id: string;
     event_id_random: string;
-    event_location_id?: string;
-    event_location_id_random?: string;
-    event_track_id?: string;
-    event_track_id_random?: string;
+    event_location_id?: string | null;
+    event_location_id_random?: string | null;
+    event_track_id?: string | null;
+    event_track_id_random?: string | null;
     
-    type_code?: string;
-    start_datetime?: string | Date;
-    end_datetime?: string | Date;
+    type_code?: string | null;
+    start_datetime?: string | Date | null;
+    end_datetime?: string | Date | null;
     
-    internal_use?: boolean;
-    record_audio?: boolean;
-    record_video?: boolean;
+    internal_use?: boolean | null;
+    record_audio?: boolean | null;
+    record_video?: boolean | null;
     
-    status?: number;
-    approve?: boolean;
-    ready?: boolean;
+    status?: number | null;
+    approve?: boolean | null;
+    ready?: boolean | null;
     
     data_json?: any;