[Mahjong] Make hai transparent

[OkanoShinri]

[codecov]

Codecov Report

Merging #1016 (8bb699e) into main (e2950be) will increase coverage by 1.42%.
Report is 9 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1016      +/-   ##
==========================================
+ Coverage   87.68%   89.10%   +1.42%     
==========================================
  Files          53       54       +1     
  Lines        5921     5895      -26     
==========================================
+ Hits         5192     5253      +61     
+ Misses        729      642      -87     

Files Changed	Coverage Δ
pgx/_src/visualizer.py	83.20% <ø> (ø)
pgx/_mahjong/_mahjong2.py	94.00% <100.00%> (+0.14%)	⬆️
pgx/_src/dwg/mahjong.py	52.84% <100.00%> (+15.55%)	⬆️

... and 2 files with indirect coverage changes