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 88.68%. Comparing base (76224df) to head (b5818a3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2407      +/-   ##
==========================================
+ Coverage   88.66%   88.68%   +0.01%     
==========================================
  Files          38       38              
  Lines        4446     4453       +7     
  Branches      876      879       +3     
==========================================
+ Hits         3942     3949       +7     
  Misses        501      501              
  Partials        3        3              

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