* add accessibility features to model search * chore: linting * fix: Improve accessibility by adding aria-label to MultiSearch input * refactor: MultiSearch component as button * refactor: Update MultiSearch component styles for improved theming * refactor: Update MultiSearch component styles for improved visual consistency --------- Co-authored-by: Derek Jackson <derek_jackson@harvard.edu> Co-authored-by: derek jackson <63861027+derekjackson-das@users.noreply.github.com> Co-authored-by: Ruben Talstra <RubenTalstra1211@outlook.com>