fix: avoid using Platform code in Web #44

[LucasXu0]

Closes #44

[codecov]

Codecov Report

Merging #48 (4139b70) into main (645e430) will increase coverage by 0.01%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   82.04%   82.06%   +0.01%     
==========================================
  Files         124      124              
  Lines        7179     7186       +7     
==========================================
+ Hits         5890     5897       +7     
  Misses       1289     1289              

Impacted Files	Coverage Δ
lib/src/service/shortcut_event/shortcut_event.dart	61.90% <0.00%> (ø)
lib/src/render/toolbar/toolbar_item.dart	93.72% <100.00%> (+0.14%)	⬆️

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