fix: Set overflow-y to clip for pre

[martinthomson]

Browsers treat an overflow: auto directive as a request to make an element scrollable, even if the element does not need it. This results in scrolling being confined to that element sometimes, such as when a document is scrolled using a mouse wheel if the document scrolls the pointer into that element. The result is that scrolling can be "trapped" on an element that doesn't really need to scroll.

This disables vertical scrolling for those pre elements that might trap scrolling in this way.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.89%. Comparing base (c7f6bde) to head (b63e592).
Report is 95 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8047      +/-   ##
==========================================
+ Coverage   88.78%   88.89%   +0.10%     
==========================================
  Files         296      304       +8     
  Lines       41320    41302      -18     
==========================================
+ Hits        36687    36715      +28     
+ Misses       4633     4587      -46     

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