Investigating activity summary email dark mode issues

[Canapin (Coin-coin le Canapin)]

Thank you for this thorough work Simon

@simon

The main issue is that the digest header’s background color gets inverted on email client that handle dark mode by performing a full color invert

This is terrible. I experience this on my smartphone and I don’t even understand how forcefully inverting colors regardless of the content was seen as a good idea.