Embedding button to lower left, cell selection

[colinmegill]

partial solution to #1650

[codecov-commenter]

Codecov Report

Merging #1658 into main will increase coverage by 5.83%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1658      +/-   ##
==========================================
+ Coverage   62.18%   68.02%   +5.83%     
==========================================
  Files          36      116      +80     
  Lines        3721    10072    +6351     
  Branches        0      463     +463     
==========================================
+ Hits         2314     6851    +4537     
- Misses       1407     3159    +1752     
- Partials        0       62      +62     

Flag	Coverage Δ
#frontend	71.43% <ø> (?)
#javascript	71.43% <ø> (?)
#smokeTestAnnotations	100.00% <ø> (?)
#unitTest	71.43% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/src/util/stateManager/schemaHelpers.js	72.34% <0.00%> (ø)
server/common/app_config.py	73.24% <0.00%> (ø)
client/src/util/nameCreators.js	100.00% <0.00%> (ø)
client/src/util/dataframe/histogram.js	91.42% <0.00%> (ø)
client/src/annoMatrix/loader.js	94.33% <0.00%> (ø)
client/src/util/fromEntries.js	100.00% <0.00%> (ø)
...nt/__tests__/util/annoMatrix/serverMocks/routes.js	88.37% <0.00%> (ø)
client/src/reducers/undoable.js	70.23% <0.00%> (ø)
server/converters/cxgtool.py	82.97% <0.00%> (ø)
server/data_common/fbs/matrix.py	91.33% <0.00%> (ø)
... and 70 more

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[bkmartinjr]

LGTM