fix(pres_mgmt): fix hidden sessions toggle not showing hidden sessions

Three related fixes for the hide/show toggle in Pres Mgmt:

1. ae_events__event_session.ts: remove redundant search_query.and hide
   filter and instead pass `hidden` to api.search_ae_obj as a URL param.
   The backend StatusFilterParams defaults to hidden='not_hidden', so
   without this the API always filtered to hide=0 regardless of intent.

2. pres_mgmt/+page.svelte (SCENARIO 2): capture qry_hidden as a
   $derived.by dependency so the liveQuery instance is recreated on
   toggle — prevents hidden sessions briefly appearing before the
   debounce fires (blink fix).

3. pres_mgmt/+page.svelte (API call): use params.qry_hidden snapshot
   instead of the live store to prevent race if user toggles during a
   pending search.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/ae_events/ae_events__event_session.ts

@@ -738,11 +738,6 @@ export async function search__event_session({
         search_query.and.push({ field: 'enable', op: 'eq', value: 1 });
     else if (enabled === 'not_enabled')
         search_query.and.push({ field: 'enable', op: 'eq', value: 0 });
-    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 (location_name) {
         search_query.and.push({
             field: 'event_location_name',
@@ -774,6 +769,7 @@ export async function search__event_session({
         view,
         limit,
         offset,
+        hidden,
         log_lvl
     });
 

src/routes/events/[event_id]/(pres_mgmt)/pres_mgmt/+page.svelte

@@ -106,6 +106,10 @@ let last_executed_key = ''; // Search Guard Key
 let lq__event_session_obj_li = $derived.by(() => {
     const ids = event_session_id_li;
     const event_id = $events_slct?.event_id;
+    // Captured as a $derived.by dependency so the liveQuery instance is recreated
+    // when qry_hidden changes — ensures SCENARIO 2 immediately reflects the new
+    // filter without waiting for the debounced search to set event_session_id_li.
+    const qry_hidden = pres_mgmt_loc.current.qry_hidden;
 
     return liveQuery(async () => {
         // SCENARIO 1: Specific IDs provided (Search Results)
@@ -117,6 +121,8 @@ let lq__event_session_obj_li = $derived.by(() => {
         }
 
         // SCENARIO 2: Fallback broad search (Only if no active filters)
+        // Applies the same hide filter as the search fast path to prevent hidden
+        // sessions briefly appearing on initial load before the debounce fires.
         if (
             event_id &&
             !pres_mgmt_loc.current.fulltext_search_qry_str &&
@@ -126,11 +132,16 @@ let lq__event_session_obj_li = $derived.by(() => {
                 console.log(
                     `Session Page LQ: Fallback search for event: ${event_id}`
                 );
-            return await db_events.session
+            const all = await db_events.session
                 .where('event_id')
                 .equals(event_id)
                 .limit(50)
                 .sortBy('name');
+            return all.filter((s: any) => {
+                if (qry_hidden === 'not_hidden') return !s.hide;
+                if (qry_hidden === 'hidden') return !!s.hide;
+                return true; // 'all'
+            });
         }
 
         return [];
@@ -310,7 +321,7 @@ async function handle_search_refresh(params: any) {
             ft_presentation_search_qry_str: qry_str || null,
             location_name: location_name || null,
             enabled: pres_mgmt_loc.current.qry_enabled ?? 'enabled',
-            hidden: pres_mgmt_loc.current.qry_hidden ?? 'not_hidden',
+            hidden: params.qry_hidden ?? 'not_hidden',
             limit: pres_mgmt_loc.current.qry_limit__sessions ?? 100,
             try_cache: true,
             log_lvl: 0