Enhance error handling in SubmitEvidenceModal component

[coderabbitai]

In the SubmitEvidenceModal component, the catch block in the submitEvidence function does not capture the error object or provide feedback to the user. Capturing the error allows for better debugging, and notifying the user improves the user experience.

PR: #1654
Comment: #1654 (comment)
Requested by @jaybuidl.