Previously, searching by presenter name in pres_mgmt returned no results
because event_presenter_li_qry_str / event_presentation_li_qry_str were
never requested or stored.
Changes:
- ae_types.ts: add event_presentation_li_qry_str + event_presenter_li_qry_str
to ae_EventSession interface
- db_events.ts: same two fields added to Session Dexie interface
- ae_events__event_session.ts:
* add ft_presentation_search_qry_str param
* auto-upgrade view to 'alt' when either ft_presenter or ft_presentation
search is used (backend requires v_event_session_w_file_count for these)
* add both fields to properties_to_save so they persist to Dexie cache
- +page.svelte (pres_mgmt):
* pass ft_presenter_search_qry_str + ft_presentation_search_qry_str in API call
* local IDB fast path now checks both new fields
* client-side filter guard also checks both new fields
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