KDE Frameworks 5.88 has arrived in the Arch repos, and Breeze folders now respect your colour scheme’s “Selection” colour or your specified Accent colour:
So you can now have Breeze in full purple to match Endeavour
KDE apps have taken their first step towards saving volatile state data (e.g window size and position) in a separate config file from the one that stores explicitly configurable settings! Dolphin now does this, and others will be ported soon (Alexander Lohnau, Frameworks 5.88 with Dolphin 21.12)