fix: update default editor background color to #181818

[erha19]

Types

• 💄 Style Changes

Background or solution

由于 editor.background 设置了 0.15 透明度，导致刷新后出现白色闪烁，使用不带透明度色值解决这一问题

Changelog

update default editor background color to #181818

[railway-app]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.36%. Comparing base (e1c2b65) to head (b192386).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3760   +/-   ##
=======================================
  Coverage   55.35%   55.36%           
=======================================
  Files        1537     1537           
  Lines       93867    93867           
  Branches    19279    19279           
=======================================
+ Hits        51961    51966    +5     
+ Misses      34763    34759    -4     
+ Partials     7143     7142    -1     

Flag	Coverage Δ
jsdom	50.82% <ø> (+<0.01%)	⬆️
node	15.57% <ø> (-0.01%)	⬇️

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