feat: Rework "Send" flow

[stanleyjones]

Closes #134 .

Before

No Asset Selected

Asset Selected

Now

No Asset Selected

Asset Selected

(I added the "required" asterisk after taking these screenshots.)

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[stanleyjones]

@fmorency This one is also ready for review. I think my organization permissions must have changed because I can't request reviewers or self-assign anymore.

[codecov[bot]]

Codecov Report

Merging #138 (06235fa) into main (983fe14) will increase coverage by 0.14%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   33.93%   34.08%   +0.14%     
==========================================
  Files          88       88              
  Lines        2260     2265       +5     
  Branches      656      659       +3     
==========================================
+ Hits          767      772       +5     
  Misses       1482     1482              
  Partials       11       11              

Files Changed	Coverage Δ
.../transactions/components/send-asset/send-asset.tsx	64.12% <66.66%> (+1.42%)	:arrow_up:

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[stanleyjones]

Ah crap, I tried to get rid of the extra commits and made it worse. Hold on.