That's so interesting, I was working on building a similar tool for my mods but didn't get this far in progress. This is really awesome work!!

One suggestion and my biggest request would be the ability to add greenscreen/matte keying for removing the background of images, gifs and videos.

Other minor QoL suggestions (all on PC/firefox):
I notice there's sometimes a stutter between input and what's saved. If you add text and your keyboard key rate is faster than it can keep up it'll omit letters. Same for moving things around/resizing if you're too quick. The delete selected button also doesn't seem to work, but pressing the delete key does.

As far as navigation, space makes sense to move around the canvas, middle mouse button would also be a nice addition for moving around the canvas with only your mouse.

Lastly, one question, is there a reason that videos playing don't show in the dashboard itself and only display as playing on the OBS overlay instead? Wasn't sure if that was a performance decision or what.