would like more of the app size page's screen real estate available to the treemap visualization

I find the treemap visualization (on the app size page) very useful, but a relatively small portion of the page (40%?) is dedicated to that widget. Consider increasing the screen real estate for it; some potential ideas:

- allow the 'library or class' table to be collapsable via a button (it can be dragged smaller, but this would just collapse it entirely)
- reduce the amount of boilerplate on that page (remove the json file path? remove the devtools version?)
- potentially move the breadcrumbs widget - which is useful - into the toolbar area?
- the 'library or class' table is mostly empty; potentially orient it on the right hand side of the page instead of the bottom (and constrain its width?)

Unrelated to any of the above, transitioning between a zoomed in view and a zoomed out one should perform an animation :)

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**DevTools version**: 2.22.2