feat: add require_auth prop to hosted file download button

- Defaults to true (authenticated_access required) — no change to existing consumers
- Launcher file buttons set require_auth=false to allow unauthenticated downloads

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

@@ -258,6 +258,7 @@
             <AE_Comp_Hosted_Files_Download_Button
                 hosted_file_id={event_file_id}
                 hosted_file_obj={event_file_obj}
+                require_auth={false}
                 classes="btn btn-sm md:btn-md lg:btn-lg preset-tonal-primary border border-primary-500 w-full"
                 click={() => {
                     modal__open_event_file_id = event_file_id;
@@ -294,6 +295,7 @@
             <AE_Comp_Hosted_Files_Download_Button
                 hosted_file_id={event_file_id}
                 hosted_file_obj={event_file_obj}
+                require_auth={false}
                 classes="btn {btn_size} gap-1 justify-between min-w-full w-full max-w-96 preset-tonal-primary border border-primary-500"
                 click={handle_open_file}
             >