Search bar display on smaller viewports looks bad

[cbeer]

[ggeisler]

I think at at md and wider breakpoints we're okay:

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At below md, I suggest we put the two distinct groups of elements on their own line:

My rough, possibly incorrect, reading of the relevant code is that we should be putting the new, ArcLight-specfic elements (the "Search" and "this collection | all collections" elements) in their own input-group instead of just inserting them into Blacklight's existing input-group. And then we display both input-groups on a single line at md and above, but on their own line at below md.

Also, to better handle the really narrow viewports, maybe we should drop the "Search" text part of the button label at below sm viewport (or even at below md just to keep things simple, although with the two button groups in their own row I don't think the text label is a problem until we get into the xs viewport range):

Note that in the mockup above I also increased the size of the search icon. It looks like it is currently set to be 1rem and we really should make it more like 24px (or 1.5rem).

[marlo-longley]

Blocked by Blacklight PRs?
Team should pair on this.