feat(style): update accent color schema

[kiaking]

Update accent color schema to match the latest Figma design. Now we have 2 slightly different colors for light/dark theme.

Also I've added --c-xxx-border color for border usage. Haven't updated where border colors are used, but that we can do progressively.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f6d3446) 82.71% compared to head (59a25ac) 82.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   82.71%   82.71%           
=======================================
  Files         120      120           
  Lines       10041    10041           
  Branches      414      414           
=======================================
  Hits         8305     8305           
  Misses       1736     1736           

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