Update notification timing could be better

[Leland]

• [x] This is a new bug that hasn't been documented in a closed issue or in the Readme.

macOS version: 15.5 Rectangle version: v0.90 (96) Logs if applicable (In Rectangle menu, hold option, "View Logging..."):

I was playing a fullscreen video game with Do Not Disturb mode on. An update popup for Rectangle appeared over the game and stole focus.