Footer: Breadcrumbs bottom margin is sometimes incorrect

[raineorshine]

Steps to Reproduce

1. Create a thought hello.
2. Quickly scroll to the bottom.
3. Scroll up and repeat.

Current Behavior

The safe-area below the breadcrumbs is sometimes preserved when scrolled all the way to the bottom.

Expected Behavior

The bottom margin is not needed when scrolled all the way to the bottom, i.e. when the safe area is not obscured. If the safe area is partially obscured, the bottom margin should adjust dynamically so that there is no extra space in between the breadcrumbs and the safe area.

[zahidhussain998]

i fixed this #2071