fix(panel): scroll the outcomes overview with the arrow keys - #203
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↑↓ stopped scrolling the Outcomes overview after #194. The key handler scrolls by grabbing the first NSScrollView in the panel, which was fine while every tab only had one, but the tab strip is a sideways ScrollView now and sits above every page so it won. The arrows were scrolling the tab strip vertically, which has nowhere to go.
Same bug on the Usage detail pane and ⌘↑↓ on both, since they all went through the same lookup.
Now it takes the first scroll view whose content actually overflows vertically. If nothing overflows it finds nothing, which is fine as there's nothing to scroll anyway.
Unit tested with plain NSScrollViews (strip above an overflowing pane, and nothing overflowing). Haven't eyeballed it in the app yet, it relies on SwiftUI giving the tab strip content the same height as its viewport.