feat(style): update bg color system

[kiaking]

Update --c-bg-elv-X colors to match the latest Figma color system. It deprecates --c-bg-soft.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dd89f13) 82.15% compared to head (2fd3256) 82.15%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #365   +/-   ##
=======================================
  Coverage   82.15%   82.15%           
=======================================
  Files         147      147           
  Lines       11806    11806           
  Branches      657      657           
=======================================
  Hits         9699     9699           
  Misses       2107     2107           

Files	Coverage Δ
lib/components/SCardHeader.vue	100.00% <100.00%> (ø)
lib/components/STableCell.vue	56.00% <100.00%> (ø)
lib/components/STableColumn.vue	76.44% <100.00%> (ø)
lib/components/STableHeader.vue	92.63% <100.00%> (ø)

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