feat: add support scopes parameter for connected accounts

[guabu]

📋 Changes

Adds support for a top-level scopes parameter when initiating a connect account flow.

🎯 Testing

See included tests.

[arpit-jn]

@claude

[github-actions]

Claude encountered an error —— View job

Failed with exit code 128

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.78%. Comparing base (b44aa97) to head (8792639).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2407      +/-   ##
==========================================
+ Coverage   88.76%   88.78%   +0.01%     
==========================================
  Files          39       39              
  Lines        4486     4493       +7     
  Branches      887      890       +3     
==========================================
+ Hits         3982     3989       +7     
  Misses        501      501              
  Partials        3        3              

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