Replace $derived(liveQuery(...)) with $derived.by(() => { const id = ...; return liveQuery(...) })
for lq__event_presenter_obj and lq__auth__event_presenter_obj in the
session page.
$derived.by() captures only the specific ID at derivation time, so
unrelated store changes do not recreate the observable. Plain $derived
closes over the entire $events_slct store object, causing unnecessary
observable recreation on any store mutation.