Summary

Add targeted regression tests for Slack image/file vision flows.

Tasks

• direct Slack image attachment test
• image-only/file-only root thread + reply test
• multi-image Slack message test
• forwarded/shared Slack attachment test where practical
• inaccessible/invalid attachment failure-path test
• run targeted Slack tests and any impacted media-understanding tests

Acceptance

• Slack vision-sensitive behavior has dedicated regression coverage

Parent

Epic: #51349