ideas :

• remove items (to split into N demos)
• update code link to proper repository, i.e. https://git.benetou.fr/utopiah/spasca-fot-sloan-q1
• better integration with viewer (e.g. side by side view)
• in XR mode
• listing of past saved demo queues

done :

• save
• linked from viewer
• re-order
• test output https://companion.benetou.fr/demos_saved_1742539103750.json
• open directly in viewer, e.g. https://companion.benetou.fr/demos_example.html?filename=demos_saved_1742882525475.json