Add appropriate focus states and border radius to the search bar

Summary

Apply proper focus states for the Recent Searches button and the search input field, and apply border radius to the search input.

Relevant Information

Initially, this should've been fixed as part of this MR, but certain complications led is to implement a more simple, partial solution.

This MR applies a hover state and removes the blue outline from the Recent Searches button.

We still need to fix the focus states and the border radius on the search input.