Collapsible/Resizable Sidebars

The left and right sidebars in SBOLCanvas can't be resized or collapsed, causing them to get in the way of designs. This problem is made worse in SynBioSuite if you need it's sidebar also open. Example of a canvas area overwhelmed by sidebars:

<img width="1281" height="687" alt="Image" src="https://github.com/user-attachments/assets/3b7c0628-7224-479d-a399-54f215fdc611" />