feat: add dark mode support (001-dark-mode)

[remarkablemark]

What is the motivation for this pull request?

feat: add dark mode support (001-dark-mode)

Button on bottom-right, toggle between 3 modes:

1. System
2. Light
3. Dark

Checklist:

• Conventional Commits
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (20b4655) to head (8b7424a).
⚠️ Report is 42 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        20    +2     
  Lines          271       354   +83     
  Branches        85       107   +22     
=========================================
+ Hits           271       354   +83     

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