• Add a /tree handler and Copy Shareable Link to file listing right click menu: #3396
• Experimental support for saved workspaces: #3490, #3586
• Added types information to the completer: #3508
• More improvements to the top level menus: #3344
• Editor settings for notebook cells: #3441
• Simplification of theme extensions: #3423
• New CSS variable naming scheme: #3403
• Improvements to cell selection and dragging: #3414
• Style and typography improvements: #3468 #3457 #3445 #3431 #3428 #3408 #3418