[web] [refactor] [ENG-716] modal design to match figma
Summary:
https://linear.app/comm/issue/ENG-716/introduce-leave-channel-modal
Test Plan:
click leave thread, leave modal thread opens, matches figma
Modal should be an exact match to the design. Letter wrapping and padding should match
figma:
proposed:
Reviewers: atul, palys-swm, def-au1t
Reviewed By: palys-swm
Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga, yayabosh
Differential Revision: https://phabricator.ashoat.com/D3624