fix: shift+enter should wrap the line in list

[LucasXu0]

Ignore the shift+enter in insertNewLine shortcut and let the system handle it.

[codecov]

Codecov Report

Attention: Patch coverage is 46.15385% with 7 lines in your changes missing coverage. Please review.

Project coverage is 72.14%. Comparing base (ea1bcd3) to head (ae45aa4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/service/shortcuts/command/backspace_command.dart	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #990      +/-   ##
==========================================
- Coverage   72.15%   72.14%   -0.02%     
==========================================
  Files         319      319              
  Lines       15224    15235      +11     
==========================================
+ Hits        10985    10991       +6     
- Misses       4239     4244       +5     

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