Currently, we send a reduced-resolution thumbnail of the whole layer that the user selects for the "Imagery: Ask Qwen" task. We should allow the user to draw a rectangle on the map to specify a region of interest in the image and crop to that region (with a higher resolution than when we send the full image). The rectangle should be saved as a Region object so that it can be reused.
Currently, we send a reduced-resolution thumbnail of the whole layer that the user selects for the "Imagery: Ask Qwen" task. We should allow the user to draw a rectangle on the map to specify a region of interest in the image and crop to that region (with a higher resolution than when we send the full image). The rectangle should be saved as a Region object so that it can be reused.