Follow up of #632 (Add color scale setting) & #806 (Add "use plotlypy" button)

[porink0424]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
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Reference Issues/PRs

#632 #806

What does this implement/fix? Explain your changes.

This is the follow-up PR of #632 & #806, which includes:

• Improve the design of the setting modal
• Change the setting items to be displayed according to the mode
• Refactor codes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1f718d9) 69.71% compared to head (e609673) 69.71%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #807   +/-   ##
=======================================
  Coverage   69.71%   69.71%           
=======================================
  Files          35       35           
  Lines        2364     2364           
=======================================
  Hits         1648     1648           
  Misses        716      716           

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[c-bata]

LGTM 👍