Bug: Clicking image attachments opens a tiny preview instead of a full-size image viewer

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Summary

When I click an image attachment in the Antigravity IDE Agent chat, the image opens as a very small thumbnail instead of a properly sized preview.

Steps to Reproduce

  1. Open Antigravity IDE.
  2. Open an Agent chat.
  3. Attach a screenshot or image.
  4. Send the message.
  5. Click the attached image.

Expected Behavior

The image should open in a large, centered preview (lightbox/modal) that scales to fit the window while preserving its aspect ratio, making screenshots easy to inspect.

Actual Behavior

The image is displayed as a very small thumbnail inside the chat, making screenshots difficult to read.

Additional Information

I’ve attached a comparison screenshot showing the current behavior on the left and the expected behavior on the right.