MAPEX-183: fix matrix scroll indicator

[emeth1]

What changed

• matrix scroll right indicator calculated on tactic change, page resize, and on matrix scroll
• matrix column amount reduces as screen size is decreased

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (001bf5b) 23.77% compared to head (520021a) 23.77%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   23.77%   23.77%           
=======================================
  Files          11       11           
  Lines        1413     1413           
=======================================
  Hits          336      336           
  Misses       1077     1077           

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[allisonrobbins]

Looks good! Publishing the build seems to be failing but I built locally to see the changes