Fix Lead List filtering and resolve Svelte 5 subscription crash

- Refactored Lead List to use direct observable subscription for better reactivity.
- Implemented in-memory 'Hard Guard' filter to ensure licensee selection is strictly enforced.
- Fixed 'TypeError: s.subscribe is not a function' by removing legacy $ prefix from resolved props.
- Resolved TypeScript typing errors in Lead Detail and Search components.
- Migrated Badge Search icons to Lucide.

src/lib/ae_events/ae_events__exhibit_tracking.ts

@@ -442,8 +442,8 @@ export async function search__exhibit_tracking({
     log_lvl = 0
 }: {
     api_cfg: any;
-    event_id: string;
-    event_exhibit_id: string;
+    event_id: string | undefined;
+    event_exhibit_id: string | undefined;
     fulltext_search_qry_str?: string | null;
     qry_group?: string | null;
     qry_external_person_id?: string | null;
@@ -460,6 +460,8 @@ export async function search__exhibit_tracking({
         console.log(`*** search__exhibit_tracking() *** exhibit_id=${event_exhibit_id} ft=${fulltext_search_qry_str}`);
     }
 
+    if (!event_id || !event_exhibit_id) return [];
+
     const search_query: any = {
         q: fulltext_search_qry_str || '',
         and: [