Render images returned by tools

[simonw]

e.g. from the Claude Code for Chrome screenshot tool:

[simonw]

Big 4.6MB example: https://static.simonwillison.net/static/2026/78d6b9f5-ccda-461f-bc9c-dd7a55716f06.jsonl

[simonw]

https://gisthost.github.io/?f48425d2e819740d770a52a4e05199a3/index.html

[simonw]

Demo: https://gisthost.github.io/?8ef41130cee34e4cb448976f2ff22590/page-001.html#msg-2026-01-12T04-19-10-688Z