feat: use text+datalist for "Add Ranger", rather than select

[srabraham]

This has various benefits over the current select dropdown:

• You can search by substring, e.g. on a second word or on real names. The current way only lets you scan the dropdown with prefixes
• If you know the Ranger handles, you can just type them (e.g. "Abraham", enter, "Tool", enter, to add both of those callsigns)
• Removes the glitchy thing where you can accidentally add a bunch of random Rangers if you type while the select field is highlighted

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.01%. Comparing base (c0fb13b) to head (c23348c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1292   +/-   ##
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  Coverage   69.01%   69.01%           
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  Files         181      181           
  Lines        8869     8869           
  Branches     1484     1484           
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  Hits         6121     6121           
  Misses       2648     2648           
  Partials      100      100           

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[wsanchez]

Oooh, cool. OK.