fix: code editor cursor bug #717
                
     Merged
            
            
          
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hard to repro consistently, but in various cases the Monaco editor will display the cursor in the wrong place
this is likely caused by something along the lines of our custom font not loading before measuring takes place, so changed it just use a system monospace font
also installed monaco-editor as a dev dependency so we can actually use its typings, and updated wrong types accordingly
also bumped tanstack-virtual dep