issue: https://linear.app/comm/issue/ENG-3405/create-a-header-with-the-search-input-field
This will be used in the message search screen. Some design changes were discussed by me and Ted, and noted on Linear.
{F527232}
{F527231}
iOS:
{F532920}
Android:
{F527230}32914}
{F527229}{F532913}