[Excalidraw] Improved Board Management / Auto-Save / Board-Library

Hi. I'm using excalidraw a lot and therefore often need to use different Boards/Canvases based on the topic I'm working on. Since I'm not allowed to use a non Company cloud portal, excalidraw+ does not come into question and hosting it locally is unfortunately not possible since it lacks collab features, which are essential for my usage. **The Problem** When having multiple Boards they often overwrite each other and since there is no easy way to auto-save when working with multiple people it becomes a real problem **Solutions** A Library system would be nice, where your boards / the links to your boards are stored  or a Auto-Save feature flag when starting a Collaboration session, that changes on user update, regardless of which user updated the board (While this would still be no perfect solution. It would improve the situation significantly) ![Image](https://github.com/user-attachments/asse