MultiSelect: UI issues

[ruchamahabal]

• Select All and Clear All compete for attention

• Clear All should probably only be shown if any option is selected

• The "x" in the search bar should probably be hidden if there is no input

• The separator between the list and the actions is too dark. Should be lighter. Probably like our dropdown separators
  
  

• The control expands/contracts as options get selected/unselected.

  multiselect.mp4

  Some other libraries, like shadcn, show multiselect pills (so that we can easily remove some options without going through the list), and the selection wraps in the input field; the width of the input field stays the same.