- launcher_file_cont: poster 'Open Poster' click now sends ae_open:event_file
command to remote display when controller=local_push and WS is connected
- +layout.svelte handle_ws_recv: ae_open: handler now looks up the file obj
from Dexie after setting modal__open_event_file_id, so the remote modal
has the hosted_file_id needed to render the poster image (was showing
'No image selected' on remote device)