feat(renderer): expose rendering errors (e.g. logged Err) via public API

[23bsm038-Mahi]

Summary

Added a public API method to access logged rendering errors.
Also emits a 'render:error' event when rendering fails.

Motivation

Helps developers debug render issues programmatically and improves testing visibility.

Implementation Details

• Added cy.getLastRenderError() method
• Emits render:error with detailed error info
• Updated internal render error handling logic

Testing

Verified locally with a simulated render failure.

[23bsm038-Mahi]

Hi maintainers
This PR adds a public API for exposing rendering errors (e.g., loggedErr) to help with debugging and testing in external tools.
I've tested this locally and verified that the API correctly reports simulated render failures.

Looking forward to your feedback!