Use :focus-visible to show focus indictor on polygon

[benchristel]

I felt like suggesting these changes inline on #1455 would be too cumbersome, so I'm doing it in a PR instead.

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to packages/perseus/src/widgets/interactive-graphs/graphs/polygon.tsx, packages/perseus/src/widgets/interactive-graphs/graphs/components/angle-indicators.tsx

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (9515cbb) and published it to npm. You
can install it using the tag PR1458.

Example:

yarn add @khanacademy/perseus@PR1458

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1458

[github-actions]

Size Change: -89 B (-0.01%)

Total Size: 850 kB

Filename	Size	Change
packages/perseus/dist/es/index.js	412 kB	-89 B (-0.02%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.2 kB
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	80.6 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	271 kB
packages/perseus-linter/dist/es/index.js	21.6 kB
packages/perseus/dist/es/strings.js	3.21 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.29%. Comparing base (a8996a1) to head (9515cbb).

Additional details and impacted files

@@                                   Coverage Diff                                    @@
##           tb/LEMS-2200/remove-line-weight-after-moving-polygon    #1458      +/-   ##
========================================================================================
+ Coverage                                                 70.11%   70.29%   +0.18%     
========================================================================================
  Files                                                       508      508              
  Lines                                                    105054   105051       -3     
  Branches                                                  10691    10718      +27     
========================================================================================
+ Hits                                                      73656    73848     +192     
+ Misses                                                    31398    31203     -195     

Files	Coverage Δ
...tive-graphs/graphs/components/angle-indicators.tsx	89.39% <ø> (+1.17%)	⬆️
.../src/widgets/interactive-graphs/graphs/polygon.tsx	90.38% <100.00%> (+1.14%)	⬆️

... and 23 files with indirect coverage changes

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[benchristel]

This prop wasn't used. Removing it so we can remove the logic to compute its value in polygon.tsx.

[benchristel]

Tamara incorporated these changes into #1455 manually, so there's no need for this PR to stay open. Closing.