Chrome extension: screenshots exceed 2000px limit on HiDPI displays

Bug Description

When using Claude computer use in Chrome on a high-resolution (Retina/HiDPI) display, the extension takes screenshots that exceed the 2000px max dimension limit for multi-image API requests. This causes the following error:

messages.1.content.104.image.source.base64.data: At least one of the image dimensions exceed max allowed size for many-image requests: 2000 pixels

This effectively breaks computer use on high-resolution screens, as the extension takes multiple screenshots during a session and they all exceed the limit.

Expected Behavior

The Chrome extension should automatically downscale screenshots to stay within the API's image size limits before sending them.

Environment

• Device: MacBook Pro M5 Max
• OS: macOS (Darwin 25.3.0)
• Browser: Chrome
• Display: Retina / HiDPI (native resolution exceeds 2000px)

Workarounds

• Resize the browser window to be smaller than 2000px
• Increase display scaling to reduce effective resolution
• Zoom in within Chrome

None of these are great UX — the extension should handle this automatically.