There is a case with browser zoom that the inline-block split view
breaks down and the two 50% tabs fall below each other. This prevents
that issue from happening.
This is a major change to the /#subscriptions page, converting it to
by a side-by-side list of streams and their settings in an overlay.
There are no new features added/removed, but it's a huge changeset,
because it replaces the old navigation logic and moves the stream
creation modal to appear in the right side of this overlay.