Implement exhibitor search constraints and sync telemetry

- Restricted public exhibitor search to Priority (paid) items only.
- Enforced 3-character search minimum for non-trusted users on landing page.
- Implemented real-time sync telemetry (last refresh and countdown) in Manage tab.
- Added auto-refresh logic with configurable intervals.

src/lib/ae_events/ae_events__exhibit.ts

@@ -362,6 +362,7 @@ export async function search__exhibit({
     fulltext_search_qry_str = null,
     enabled = 'enabled',
     hidden = 'not_hidden',
+    priority = 'all',
     view = 'default',
     order_by_li = { name: 'ASC' },
     limit = 100,
@@ -374,6 +375,7 @@ export async function search__exhibit({
     fulltext_search_qry_str?: string | null;
     enabled?: 'enabled' | 'all' | 'not_enabled';
     hidden?: 'hidden' | 'all' | 'not_hidden';
+    priority?: 'all' | 'priority' | 'not_priority';
     view?: string;
     order_by_li?: any;
     limit?: number;
@@ -398,6 +400,9 @@ export async function search__exhibit({
     if (hidden === 'hidden') search_query.and.push({ field: 'hide', op: 'eq', value: 1 });
     else if (hidden === 'not_hidden') search_query.and.push({ field: 'hide', op: 'eq', value: 0 });
 
+    if (priority === 'priority') search_query.and.push({ field: 'priority', op: 'eq', value: 1 });
+    else if (priority === 'not_priority') search_query.and.push({ field: 'priority', op: 'eq', value: 0 });
+
     try {
         const result_li = await api.search_ae_obj_v3({
             api_cfg,

src/lib/stores/ae_events_stores.ts

@@ -477,6 +477,9 @@ const events_session_data_struct: key_val = {
 
         submit_status__search: null, // 'searching', 'complete'
 
+        last_refresh_time: null as string | null,
+        next_refresh_countdown: 0,
+
         // The entered_passcode is the exhibit booths shared passcode for staff. This is used to initially access the lead retrieval service.
         entered_passcode: null,