fix(launcher): poster session display — metadata, image modal, file paths

1. launcher_presentation_view: accept session_type prop from parent
   instead of relying on event_session_type_code on file objects (which
   is not reliably populated in Dexie). Use session_type to correctly
   set hide_meta, session_type, and open_method on the file container.

2. launcher_session_view: pass session_type={type_code} to
   Launcher_presentation_view; restore Launcher_presenter_view_posters
   in the presenter list for poster mode (hide_name=true). Some events
   store poster files at the PRESENTER level (for_id=event_presenter_id)
   — particularly group/company presenters — so both paths must render.

3. launcher/+layout.svelte: fix poster modal image 403. The img src was
   using the event_file download endpoint which requires auth headers a
   plain img tag cannot send. Switched to the hosted_file endpoint with
   key=account_id, which is browser-compatible. Also guarded on
   modal__event_file_obj.hosted_file_id for safer access.

4. launcher_cfg_screen_saver: rename section title to 'Poster Screen Saver'.

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

src/routes/events/[event_id]/(launcher)/cfg_components/launcher_cfg_screen_saver.svelte

@@ -10,7 +10,7 @@
 </script>
 
 <Launcher_Cfg_Section
-    title="Digital Screen Saver"
+    title="Poster Screen Saver"
     icon="fa-id-badge"
     bind:state={$events_loc.launcher.section_state__screen_saver}
     {on_expand}

src/routes/events/[event_id]/(launcher)/launcher/+layout.svelte

@@ -870,11 +870,16 @@
         Close Remote Poster Display Only
     </button>
 
-    {#if $events_sess.launcher.modal__open_event_file_id}
+    {#if $events_sess.launcher.modal__event_file_obj?.hosted_file_id}
+        <!-- WHY: Use hosted_file endpoint (not event_file) — the event_file download
+             endpoint requires auth headers that a plain <img> tag cannot send (→ 403).
+             The hosted_file endpoint accepts key=account_id as a query param and is
+             the proven browser-compatible path for direct file display. -->
         <img
-            src="{$ae_api.base_url}/v3/action/event_file/{$events_sess.launcher
-                .modal__open_event_file_id}/download?filename={$events_slct
-                .event_file_obj.filename}&key={$ae_api.account_id}"
+            src="{$ae_api.base_url}/v3/action/hosted_file/{$events_sess.launcher
+                .modal__event_file_obj.hosted_file_id}/download?return_file=true&filename={encodeURIComponent(
+                $events_sess.launcher.modal__event_file_obj.filename ?? ''
+            )}&key={$ae_api.account_id}"
             alt="Poster"
             class="min-h-28 min-w-md max-h-full max-w-full"
         />

src/routes/events/[event_id]/(launcher)/launcher_presentation_view.svelte

@@ -1,9 +1,10 @@
 <script lang="ts">
     interface Props {
         lq__event_presentation_obj: any;
+        session_type?: string;
     }
 
-    let { lq__event_presentation_obj }: Props = $props();
+    let { lq__event_presentation_obj, session_type = '' }: Props = $props();
 
     import { liveQuery } from 'dexie';
     import { db_events } from '$lib/ae_events/db_events';
@@ -67,17 +68,13 @@
                         event_file_id={event_file_obj.event_file_id}
                         {event_file_obj}
                         hide_created_on={false}
-                        hide_meta={event_file_obj?.event_session_type_code == 'poster'}
+                        hide_meta={session_type == 'poster'}
                         bind:hide_draft={
                             $events_loc.launcher.hide_content__draft_files
                         }
                         show_bak_download={$ae_loc.trusted_access}
-                        session_type={event_file_obj?.event_session_type_code ??
-                            'oral'}
-                        open_method={event_file_obj?.event_session_type_code ==
-                        'poster'
-                            ? 'modal'
-                            : null}
+                        session_type={session_type || 'oral'}
+                        open_method={session_type == 'poster' ? 'modal' : null}
                         modal_title={lq__event_presentation_obj?.name}
                         bind:modal__title={$events_sess.launcher.modal__title}
                         bind:modal__open_event_file_id={

src/routes/events/[event_id]/(launcher)/launcher_session_view.svelte

@@ -414,9 +414,17 @@
                             <!-- Presentation-level files -->
                             <Launcher_presentation_view
                                 lq__event_presentation_obj={event_presentation_obj}
+                                session_type={type_code}
                             />
 
                             <!-- The presenter list -->
+                            <!-- WHY: In poster mode, presenter names are already shown inline
+                                 in the presentation header above, so hide_name=true.
+                                 We still render Launcher_presenter_view_posters here because
+                                 some events store files at the PRESENTER level (for_id=event_presenter_id)
+                                 rather than the presentation level — particularly group/company presenters.
+                                 The component renders nothing if there are no presenter-level files,
+                                 so this has no visual cost for events that use presentation-level files. -->
 
                             {#if $lq__event_presenter_obj_li && $lq__event_presenter_obj_li.length}
                                 <ul class="event_presentation_presenter_list">
@@ -442,15 +450,10 @@
                                                         lq__event_presenter_obj={event_presenter_obj}
                                                     />
                                                 {/if}
-                                                <!-- {index} -->
                                             </li>
                                         {/if}
                                     {/each}
                                 </ul>
-                            {:else}
-                                <span class="event_launcher_no_presenters"
-                                    >No presenters to display</span
-                                >
                             {/if}
                         </li>
                     {/each}