Looks good.

Since the release notes are (partially) autogenerated from PRs, and (more importantly) because it's harder to to review disparate aspects of a single PR, it'd probably be better if you broke this in two or three. The commits look nicely atomic: each would work well as a separate PR (with its own line in the release notes), IMO.

For me, changing redis del to unlink is an immediate approval. But although the CSS and JS changes are probably good, they (especially dark mode) require visual inspection which requires extra time from the maintainers.

@nevans thanks and sorry i actually was trying to rebase this and pr into our repo - but if we can merge these upstream that'd be amazing and i'll push a new pr for each feature.