Allow QA view to be larger than viewport height if necessary

[emma-sg]

Closes #1789

Changes

• Converts stylesheet in js to css now that it doesn't use any runtime values
• Removes fixed height on QA container, and instead sets a min height
• Applies contain: size to page list & tab content so they don't cause the QA container to stretch
• Also updates instances of h-{n} w-{n} to size-{n}
• Removes leftover outlines on text and resource comparison areas from early QA prototyping

[SuaYoo]

@emma-sg I can look into the scroll snap issue here after the merge conflict is fixed, and if this is rebased?

[emma-sg]

@SuaYoo I think I fixed it in the merge! It only applies on large viewports now (where the layout is split into cols)