[web] [fix] ENG-895 Chat Thread List Menu button and time doesn't match design

Summary:
https://linear.app/comm/issue/ENG-895/chat-thread-list-menu-button-and-time-doesnt-match-design

Space out menu button and last time. The size of the chat thread list item is still the incorrect size and will be updated in another diff.

before:

Test Plan: Chat thread list items should look like the screen shot and closer to figma. Will look much closer to figma once the chat thread list items are correctly sized.

Reviewers: atul, palys-swm, def-au1t, ashoat

Reviewed By: palys-swm, ashoat

Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D3454