Restore Event Session search stability and advance platform-wide string ID standardization

- Restored Event Session search by standardizing on 'event_id' for Dexie queries and implementing dual-layer filtering (local + API guard) to prevent broad results from clobbering filtered views.
- Advanced String-Only ID Standardization (Phase 2) by updating generic object processors across all event library modules to support both base IDs and legacy '_random' variants.
- Refactored Event Presenter and Presentation components to support standardized '_id_li' props while maintaining backward compatibility.
- Standardized common helper identifiers to snake_case (e.g., 'prevent_default') in the Events module.
- Verified Staff and Poster email notification logic in the Bulletin Board module.
- Updated .gitignore and cleaned up test artifacts.

src/routes/events/[event_id]/+page.svelte

@@ -91,7 +91,7 @@
             if (event_id && !$events_loc.pres_mgmt.fulltext_search_qry_str && !$events_loc.pres_mgmt.location_name_qry_str) {
                 if (log_lvl) console.log(`Session Page LQ: Fallback search for event: ${event_id}`);
                 return await db_events.session
-                    .where('event_id_random')
+                    .where('event_id')
                     .equals(event_id)
                     .limit(50)
                     .sortBy('name');
@@ -124,9 +124,7 @@
         const params = search_params;
         if (search_debounce_timer) clearTimeout(search_debounce_timer);
         search_debounce_timer = setTimeout(() => {
-            untrack(() => {
-                handle_search_refresh(params);
-            });
+            handle_search_refresh(params);
         }, 300);
         return () => {
             if (search_debounce_timer) clearTimeout(search_debounce_timer);
@@ -157,7 +155,7 @@
             try {
                 if (event_id) {
                     let local_results = await db_events.session
-                        .where('event_id_random')
+                        .where('event_id')
                         .equals(event_id)
                         .filter(session => {
                             if (location_name && session.event_location_name !== location_name) return false;
@@ -180,7 +178,7 @@
                         .toArray();
 
                     local_results.sort((a, b) => (a.name ?? '').localeCompare(b.name ?? ''));
-                    const local_ids = local_results.map(s => s.id || s.event_session_id_random).filter(Boolean);
+                    const local_ids = local_results.map(s => s.id || s.event_session_id).filter(Boolean);
 
                     if (current_search_id === last_search_id) {
                         if (log_lvl) console.log(`[Session Search #${current_search_id}] Fast Path found ${local_ids.length} items locally.`);
@@ -215,8 +213,26 @@
             });
 
             if (current_search_id === last_search_id) {
-                const api_results = results || [];
-                const api_ids = api_results.map((s: any) => s.id || s.event_session_id_random).filter(Boolean);
+                let api_results = results || [];
+                
+                // Client-side Filter Guard: Ensure API results match local criteria (Backup filter)
+                api_results = api_results.filter(session => {
+                    if (location_name && session.event_location_name !== location_name) return false;
+                    if (qry_str) {
+                        const name = (session.name ?? '').toLowerCase();
+                        const code = (session.code ?? '').toLowerCase();
+                        const description = (session.description ?? '').toLowerCase();
+                        const qry_string = (session.default_qry_str ?? '').toLowerCase();
+                        const match = name.includes(qry_str) || 
+                                      code.includes(qry_str) || 
+                                      description.includes(qry_str) ||
+                                      qry_string.includes(qry_str);
+                        if (!match) return false;
+                    }
+                    return true;
+                });
+
+                const api_ids = api_results.map((s: any) => s.id || s.event_session_id).filter(Boolean);
                 
                 untrack(() => {
                     $events_slct.event_session_obj_li = api_results;
@@ -251,7 +267,7 @@
         $events_loc.pres_mgmt.search_version++;
     }
 
-    function preventDefault<T extends Event>(fn: (event: T) => void) {
+    function prevent_default<T extends Event>(fn: (event: T) => void) {
         return function (event: T) {
             event.preventDefault();
             fn(event);
@@ -325,7 +341,7 @@
     {#if !$events_loc.pres_mgmt.show_content__event_view || $events_loc.pres_mgmt.show_content__event_view == 'default'}
         <div class="ae_container_actions">
             <form
-                onsubmit={preventDefault(() => handle_search_trigger())}
+                onsubmit={prevent_default(() => handle_search_trigger())}
                 autocomplete="off"
                 class="form grow flex flex-row flex-wrap gap-1 justify-center items-center w-full"
             >
@@ -487,9 +503,9 @@
             <div class="overflow-x-auto w-max max-w-full">
                 <Element_manage_event_file_li_wrap
                     link_to_type={'event'}
-                    link_to_id={$lq__event_obj?.event_id_random}
-                    allow_basic={$events_loc.auth__kv.session[$lq__event_obj?.event_id_random]}
-                    allow_moderator={$events_loc.auth__kv.session[$lq__event_obj?.event_id_random]}
+                    link_to_id={$lq__event_obj?.event_id}
+                    allow_basic={$events_loc.auth__kv.session[$lq__event_obj?.event_id]}
+                    allow_moderator={$events_loc.auth__kv.session[$lq__event_obj?.event_id]}
                     container_class_li={''}
                 />
             </div>