feat(launcher): auto-apply kiosk URL params on Launcher link for poster sessions

When on a Poster Session in Pres Mgmt, the Launcher nav link now appends
?iframe=true&launcher_menu=hide so the recipient opens a clean kiosk view
without the site header or left session panel.

- ae_comp__events_menu_nav: add events__launcher_extra_params prop; update
  launcher_sess_qry to merge extra params after session_id
- session_page_menu: derive is_poster from type_code and pass the kiosk
  params into the Launcher link

src/routes/events/[event_id]/(pres_mgmt)/session/[session_id]/session_page_menu.svelte

@@ -36,6 +36,9 @@
     let show_modal = $state(false);
     let show_help = $state(false);
 
+    // Detect poster sessions so the Launcher link auto-applies kiosk URL params
+    let is_poster = $derived($lq__event_session_obj?.type_code === 'poster');
+
     async function on_toggle(field: string, new_val: boolean) {
         await api.update_ae_obj_v3({
             api_cfg: $ae_api,
@@ -91,6 +94,7 @@
             events__launcher_session_id={$lq__event_session_obj?.event_session_id && $ae_loc.administrator_access
                 ? $lq__event_session_obj?.event_session_id
                 : null}
+            events__launcher_extra_params={is_poster ? 'iframe=true&launcher_menu=hide' : ''}
             events__location_id={$lq__event_session_obj?.event_location_id && $ae_loc.trusted_access
                 ? $lq__event_session_obj?.event_location_id
                 : null}