feat(ui): display image attachments from tool results - #21352

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Auto-closed by the cleanup bot rather than on review — CI passed 11/11 and the implementation directly addresses #21227. Could a maintainer reopen for review?

I’m hitting this in OpenCode web: image attachments from tool results are not rendered in the chat UI, so the practical workaround is exposing the image through a temporary URL and pasting a link.

#21352 looks like the narrow UI fix for this general class of tool-result image attachments. I checked it against current dev today (b2a06351b) and it still merges conflict-free; the patch only touches packages/ui/src/components/message-part.tsx and packages/ui/src/components/message-part.css.

Since this was auto-closed rather than reviewed/rejected, could it be reopened for review? Happy to help test or open a fresh rebased PR if maintainers prefer.

Please review and don't close