Help modal improvements

[juliusknorr]

• fix: Add missing shortcut for checklists to help modal
• fix: Use proper mod key on macOS in help modal
• fix: Change help modal size to force scrolling

📝 Summary

• Resolves: Add keyboard shortcut for checklist #6925

🖼️ Screenshots

🏚️ Before	🏡 After

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 37.94%. Comparing base (35db36e) to head (09b1c3e).

Files with missing lines	Patch %	Lines
src/components/HelpModal.vue	0.00%	2 Missing ⚠️
src/components/Suggestion/Mention/suggestions.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6926      +/-   ##
==========================================
+ Coverage   37.82%   37.94%   +0.12%     
==========================================
  Files         750      735      -15     
  Lines       42691    42546     -145     
  Branches     1273     1258      -15     
==========================================
  Hits        16146    16146              
+ Misses      25923    25793     -130     
+ Partials      622      607      -15     

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