fix(types): partial style options for `box`

[escral]

Implementation already supports partial options

[codecov[bot]]

Codecov Report

Merging #210 (aa07536) into main (2e72913) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #210   +/-   ##
=======================================
  Coverage   61.22%   61.22%           
=======================================
  Files          13       13           
  Lines        1377     1377           
  Branches       58       58           
=======================================
  Hits          843      843           
  Misses        534      534           

Impacted Files	Coverage Δ
src/utils/box.ts	66.98% <100.00%> (ø)