BUG: crash when screen resumes from screen saver #535

Describe the bug
When I unlock my screen (system was idle, it auto-locked), StreamController crashes

To Reproduce
Steps to reproduce the behavior:

1. Start StreamController
2. wait for auto-lock
3. Unlock
4. Crash

(this is both with resume (beta) feature turned off or on).

It is probably timing related, as I can't reproduce if I manually lock and unlock the screen.

Additional context
I'm using flatpak version

extract from logs:
2026-01-15 08:46:44.736 | SUCCESS | src.app:on_activate:125 - Finished loading app
2026-01-15 08:46:44.737 | INFO | autostart:request_background_callback:64 - request_background success=True
2026-01-15 10:23:37.862 | INFO | src.backend.LockScreenManager.LockScreenManager:lock:63 - Locking screen: True
2026-01-15 10:23:37.869 | INFO | src.backend.DeckManagement.Subclasses.ScreenSaver:show:94 - Showing screen saver
2026-01-15 10:23:37.970 | DEBUG | src.backend.DeckManagement.DeckController:update_all_inputs:434 - Updating all inputs took 0.00996541976928711 seconds
2026-01-15 10:28:06.313 | INFO | src.backend.LockScreenManager.LockScreenManager:lock:63 - Locking screen: False
2026-01-15 10:28:06.314 | INFO | src.backend.DeckManagement.Subclasses.ScreenSaver:hide:126 - Hiding screen saver
2026-01-15 10:28:06.319 | INFO | src.backend.DeckManagement.DeckController:load_page:721 - Loading page Default on deck AL46K2C70873
2026-01-15 10:28:06.392 | INFO | src.backend.DeckManagement.DeckController:load_background:571 - Loading background in thread: 140457258489536
2026-01-15 10:28:08.206 | INFO | streamcontroller_plugin_tools.BackendBase:on_disconnect:39 - Connection closed
/app/bin/launch.sh : ligne 3 : 3 segfault (core dumped)python3 /app/bin/StreamController/main.py "$@"