* feat(map-server): add screenshot to updateModelContext and remove rounded corners
- Remove border-radius and overflow: hidden from cesiumContainer CSS
- Capture map canvas as base64 PNG and include in updateModelContext
- Only include image if host supports image content blocks
* feat(map-server): reduce screenshot size for fewer tokens
- Scale down to max 256px (longest dimension)
- Use PNG for better quality with map graphics
* prettier
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