perf(launcher): implement staggered data loading for sessions and presentations

- Optimized session list load to be shell-only, preventing initial request storms.\n- Moved deep data fetching (presenters/files) into the Presentation component level using Svelte effects.\n- Deferred child collection lookups until components are rendered in the DOM.\n- Fixed ae_api import in launcher_presentation_view.\n- Hardened background refresh logic to respect requested views.

src/lib/ae_events/ae_events__event_presentation.ts

@@ -153,9 +153,13 @@ export async function load_ae_obj_li__event_presentation({
                 _refresh_presentation_li_background({ api_cfg, for_obj_type, for_obj_id, inc_file_li, inc_presenter_li, enabled, hidden, view, limit, offset, order_by_li, try_cache, log_lvl: 0 });
                 
                 // Warm cache for nested loads in the background (FIRE AND FORGET)
+                // DEPRECATED Optimization: Don't fire child loads for every item in a list here.
+                // Let the specific Presentation component handle its own children to stagger requests.
+                /*
                 cached_li.forEach(p => {
                     _handle_nested_loads(p, { api_cfg, inc_file_li, inc_presenter_li, enabled, hidden, limit, offset, try_cache, log_lvl: 0 });
                 });
+                */
 
                 return cached_li;
             }

src/lib/ae_events/ae_events__event_session.ts

@@ -198,7 +198,8 @@ export async function load_ae_obj_li__event_session({
                 // Background refresh (non-blocking)
                 _refresh_session_li_background({ 
                     api_cfg, for_obj_type, for_obj_id, view, 
-                    inc_file_li, inc_all_file_li, inc_presentation_li, inc_presenter_li, 
+                    // Optimization: Disable nested loads for list members to prevent request storms
+                    inc_file_li: false, inc_all_file_li: false, inc_presentation_li: false, inc_presenter_li: false, 
                     enabled, hidden, limit, offset, order_by_li, try_cache, 
                     log_lvl: log_lvl > 1 ? log_lvl : 0 
                 });
@@ -231,6 +232,14 @@ async function _refresh_session_li_background({ api_cfg, for_obj_type, for_obj_i
                 await db_save_ae_obj_li__ae_obj({ db_instance: db_events, table_name: 'session', obj_li: processed, properties_to_save, log_lvl });
                 if (log_lvl) console.log(`💾 [Trace] _refresh_session_li: Saved to IDB cache.`);
             }
+
+            // Fire nested loads for each session only if explicitly requested (usually only for single objects)
+            if (inc_file_li || inc_presentation_li) {
+                processed.forEach(s => {
+                    _handle_nested_loads(s, { api_cfg, inc_file_li, inc_all_file_li, inc_presentation_li, inc_presenter_li, enabled, hidden, limit, offset, try_cache, log_lvl: 0 });
+                });
+            }
+
             return processed;
         }
     } catch (e) {

src/routes/events/[event_id]/(launcher)/launcher/[event_location_id]/+page.ts

@@ -53,10 +53,10 @@ export async function load({ params, parent, url }) {
             api_cfg: ae_acct.api,
             for_obj_type: 'event_location',
             for_obj_id: event_location_id,
-            inc_file_li: true,
-            inc_all_file_li: true,
-            inc_presentation_li: true,
-            inc_presenter_li: true,
+            inc_file_li: false, // Optimized: Shell load for lists
+            inc_all_file_li: false,
+            inc_presentation_li: false, // Optimized: Shell load for lists
+            inc_presenter_li: false,
             enabled: 'enabled',
             hidden: 'all',
             view: 'alt', // Standardized View for file counts and extended metadata
@@ -69,6 +69,22 @@ export async function load({ params, parent, url }) {
         );
     }
 
+    const session_id = url.searchParams.get('session_id');
+    if (browser && session_id) {
+        if (log_lvl) console.log(`Triggering deep load for session_id: ${session_id}`);
+        events_func.load_ae_obj_id__event_session({
+            api_cfg: ae_acct.api,
+            event_session_id: session_id,
+            inc_file_li: true,
+            inc_all_file_li: true,
+            inc_presentation_li: true,
+            inc_presenter_li: true,
+            view: 'alt',
+            try_cache: true,
+            log_lvl: 0
+        });
+    }
+
     // WARNING: Precaution against shared data between sites and sessions.
     data[account_id] = ae_acct;
 

src/routes/events/[event_id]/(launcher)/launcher_presentation_view.svelte

@@ -7,10 +7,26 @@
 
     import { liveQuery } from 'dexie';
     import { db_events } from '$lib/ae_events/db_events';
-    import { ae_loc } from '$lib/stores/ae_stores';
+    import { ae_loc, ae_api } from '$lib/stores/ae_stores';
     import { events_loc, events_sess } from '$lib/stores/ae_events_stores';
+    import { events_func } from '$lib/ae_events_functions';
     import Event_launcher_file_cont from './launcher_file_cont.svelte';
 
+    // Staggered Load: Trigger deep fetch only when component is active
+    $effect(() => {
+        const id = lq__event_presentation_obj?.event_presentation_id;
+        if (id) {
+            events_func.load_ae_obj_id__event_presentation({
+                api_cfg: $ae_api,
+                event_presentation_id: id,
+                inc_file_li: true,
+                inc_presenter_li: true,
+                try_cache: true,
+                log_lvl: 0
+            });
+        }
+    });
+
     // Event File (Directly linked to presentation)
     let lq__event_file_obj_li = $derived(
         liveQuery(async () => {