Add row highlight on row select

[podliashanyk]

Implemented changes:

• slightly increased contrast between colored data cells and row background (so that the contrast is universally acceptable on different row states)
• hilghlighted checked rows by changing its background color

UI before:

UI after:

[github-actions]

Test results

  4 files    4 suites   8s ⏱️
14 tests 14 ✔️ 0 💤 0 ❌
56 runs  56 ✔️ 0 💤 0 ❌

Results for commit 87c1ee8.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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##             main      #33   +/-   ##
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  Coverage        ?   47.30%           
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  Files           ?       15           
  Lines           ?      890           
  Branches        ?        0           
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  Hits            ?      421           
  Misses          ?      469           
  Partials        ?        0           

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