Fix: Add fallback image for broken agent avatars #2008
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Fixes #1983
What kind of change does this PR introduce?
Bug fix
Why was this change needed?
When agent image URLs are broken or unavailable, a broken image icon is displayed instead of a fallback, reducing the user experience quality. This PR ensures that when an image fails to load, users see the default Robot avatar instead of a broken image placeholder.
Changes made
Testing
I verified the logic of the onError handler through code review and created a simple test to validate the fallback behavior. Full integration testing was not possible due to local environment setup issues with Docker, but the onError pattern is a standard React approach for handling image load failures.