Optimize qss

[5yutan5]

Toggle theme by using qdarktheme.setup_theme has delay. The main delay occurs at Qt stylesheet system.

Optimize qss and decrease delay.

[codecov[bot]]

Codecov Report

Merging #214 (7047df7) into main (8e34d7e) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
+ Coverage   98.32%   98.39%   +0.06%     
==========================================
  Files          39       39              
  Lines        1432     1432              
==========================================
+ Hits         1408     1409       +1     
+ Misses         24       23       -1     

Impacted Files	Coverage Δ
qdarktheme/_resources/_template_stylesheet.py	100.00% <100.00%> (ø)
qdarktheme/_style_loader.py	100.00% <0.00%> (+1.16%)	:arrow_up:

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