Feature request: Enable mouse clicks and mouse scrolling separately

[mattg-imprint]

I set this in my tui.json file b/c I wanted to use default mouse click behavior for my terminal:

{
	"$schema": "https://opencode.ai/tui.json",
	"mouse": false,
}

But that also gave default mouse scroll behavior, which causes the scroll to only work in the input window instead of the output window.

It would be great if the capturing mouse clicks and mouse scrolls could be separate flags.