Refactor sidebar drawer handler to improve speed and functionality

[hisownspace]

the currently implemented sidebar resizing functionality drastically reduces render speed, and over time the problem gets worse. The code needs to be refactored, using refs and other efficiency-saving techniques (usememo?)

• [x] clean up functions:
• [x] investigate gains associated with simply memoizing the sidebar handler
• [x] remove unnecessary keys in resize obj
• [x] replace querySelectors with useRefs for dom elements
  • [x] onMouseDown={grabBorder}
  • [x] onMouseUp={releaseBorder}
  • [x] onMouseOver={styleBorder}
  • [x] onMouseLeave={unstyleBorder}

[hisownspace]

Resizing is still a bit inaccurate. This is in part due to the styling of the sidebar. find a way to allow dynamic width while keeping the left side anchored.