[Bug]: No JXL support on agent sandbox and web frontend #541

Product or interface

CLI - headless

Version

i am using the webapp

Platform

Multiple platforms

OS version and architecture

i am using the webapp

Issue area

Tool call / permission / sandbox

Desktop log upload ID (optional)

No response

Steps to reproduce

bug-report-short.md
image-mime-allowlist-bug-report.md

Expected and actual behavior

long story short , i am using the webapp to draw stuff with your agent , and i also did some testing with image format along the way , your agent claim that avif lossless is not working , and jxl is also not working (only encode works)
since google ships .jxl support weeks ago , it shouldn't be too hard "https://developer.chrome.com/blog/jpeg-xl-in-chrome"
have an nice day

Redacted error summary

Screenshots

No response

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• I have searched existing issues.
• I have included my version and removed sensitive information.