fix(locations): auto-load locations on page open; fix session query and POC visibility

- Add +page.ts to trigger load_ae_obj_li__event_location on page load (locations
  were never fetched without a manual trigger)
- Fix ae_comp__event_session_obj_li_wrapper: query used event_location_id_random
  (deprecated index) instead of event_location_id, causing empty session lists
  under each location
- Wire hide__session_poc to pres_mgmt_loc.current.show__session_li_poc_field so
  the Options toggle actually takes effect in the per-location session list
- Also set hide__session_location=true since location is implicit in that context

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

documentation/TODO__Agents.md

@@ -5,8 +5,9 @@
 
 ## 🔴 BGH Conference — April 21 (Must Fix Before Event)
 
-- [ ] **[Locations] Event Locations list does not auto-load** — list must be loaded automatically on
-  page open; currently requires manual trigger. Also needs general cleanup of the Locations list UI.
+- [x] **[Locations] Event Locations list does not auto-load** — added `+page.ts` to trigger
+  `load_ae_obj_li__event_location` on page load. Also fixed session query using stale
+  `event_location_id_random` index (should be `event_location_id`). (2026-04-19)
 
 - [ ] **[Files] Warn/error on `.ppt` upload** — if a presenter tries to upload a `.ppt` file (legacy
   PowerPoint format), show a clear warning or block the upload with an error message instructing them
@@ -19,9 +20,10 @@
   the build and deployment process; verify the latest version is installed and functional on the
   onsite Mac laptops before April 21.
 
-- [ ] **[Pres Mgmt] POC column shown in "Sessions at this Location"** — the POC (Point of Contact)
-  column is appearing in the Sessions at this Location view when it should be hidden. Identify the
-  condition controlling visibility and suppress it in this context.
+- [x] **[Pres Mgmt] POC column shown in "Sessions at this Location"** — wired
+  `hide__session_poc={!pres_mgmt_loc.current.show__session_li_poc_field}` in
+  `ae_comp__event_location_obj_li.svelte`; also set `hide__session_location={true}` since
+  location is implicit in that context. (2026-04-19)
 
 ---