Display analyzed image in chat

[jck411]

Enable display of images from tool outputs in the chat frontend by rehydrating attachments in the backend and processing them in the frontend.

Previously, when a tool like gdrive_analyze_image was invoked, the LLM would analyze the image and provide a description, but the image itself was not visible in the chat interface. This PR ensures that the backend includes the full multimodal content with signed URLs in the tool event payload, and the frontend's chat store is updated to correctly parse and display these attachments, making the image visible to the user.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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