fix(pres-mgmt): inject event_id into nested presenter/presentation creates

v_event_presenter and v_event_presentation both use INNER JOIN with event
on event_id. Without event_id in the payload the view returns 0 rows after
INSERT, the API falls back to a minimal response, and Dexie save fails
with "Object is missing a valid ID". Pull event_id (and event_session_id
for presenters) from events_slct at creation time.

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

src/lib/ae_events/ae_events__event_presenter.ts

@@ -323,12 +323,21 @@ export async function create_ae_obj__event_presenter({
         );
         return null;
     }
+    // event_id and event_session_id are required for the v_event_presenter view
+    // (which uses INNER JOIN with event on event_id). Without them the API cannot
+    // return the full object after creation and the Dexie save fails.
+    const ev_slct = get(events_slct);
+    const fields_with_ids = {
+        event_id: ev_slct.event_id ?? undefined,
+        event_session_id: ev_slct.event_session_id ?? undefined,
+        ...data_kv
+    };
     const result = await api.create_nested_obj({
         api_cfg,
         for_obj_type: 'event_presentation',
         for_obj_id: event_presentation_id,
         obj_type: 'event_presenter',
-        fields: { ...data_kv },
+        fields: fields_with_ids,
         log_lvl
     });