fix(launcher/files): hide admin-purpose files and fix event_file_id in PATCH body

- launcher_file_cont: add 'admin' file_purpose to hide_draft filter (alongside outline/draft)
- element_manage_event_file_li: remove event_file_id from data_kv passed to update_ae_obj;
  it was being sent in the PATCH body causing 'Unknown column event_file_id in SET' (400)

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

src/lib/elements/element_manage_event_file_li.svelte

@@ -636,8 +636,6 @@ async function handle_convert_pdf_to_image(event_file_obj: key_val) {
                                                     );
 
                                                     let event_file_data = {
-                                                        event_file_id:
-                                                            event_file_obj.event_file_id,
                                                         file_purpose: (
                                                             e.target as HTMLInputElement
                                                         ).value

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

@@ -237,7 +237,8 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
     class:justify-center={hide_meta}
     class:hidden={hide_draft &&
         (event_file_obj.file_purpose == 'outline' ||
-            event_file_obj.file_purpose == 'draft')}
+            event_file_obj.file_purpose == 'draft' ||
+            event_file_obj.file_purpose == 'admin')}
     class="event_launcher_file_cont flex max-w-full grow flex-col flex-wrap items-center justify-center gap-1 transition-all md:flex-row">
     {#if open_file_clicked}
         <div