feat: Make API error messages expandable to show full details

[roomote]

Fixes #6139

Summary

This PR makes API error messages expandable in the chat feed, allowing users to view full error details similar to how successful API requests can be expanded.

Changes

• Added errorDetails field to ClineApiReqInfo interface to store full error information
• Modified ChatRow component to make failed API requests clickable/expandable
• Updated Task.ts to capture and store complete error details when API requests fail
• Added comprehensive tests for the new functionality

Testing

• Added unit tests for all new functionality
• All existing tests pass
• Manually tested expanding/collapsing error messages in the UI

Screenshots

Before: API errors show only a brief message with no way to see details
After: API errors can be clicked to expand and show full error details including status codes, error types, and complete error messages

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Important

This PR makes API error messages expandable in the chat feed, capturing full error details in Task.ts and updating ChatRow to display them, with comprehensive tests added.

• Behavior:
  • API error messages in ChatRow are now expandable to show full details, including status codes and error types.
  • Task.ts captures and stores complete error details when API requests fail.
• Components:
  • ChatRow.tsx modified to make failed API requests clickable/expandable.
  • errorDetails field added to ClineApiReqInfo in ExtensionMessage.ts.
• Testing:
  • Added unit tests in ChatRow.spec.tsx for expanding/collapsing error messages.
  • Tests ensure error details are displayed correctly when expanded.

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[daniel-lxs]

Closing for now while the issue author works on his implementation, but this should be checked again before merging.