The Wednesday→Tuesday birthday week (cached, and re-rendered when it rolls
over so an app left open for days lights up on its own), the canvas confetti
loop, the gold glow, and the Birthday Mode controls — on/off, intensity, and
a force-on picker for testing that lives in memory and clears on restart.
The confetti deliberately ignores OS reduced-motion: it is a celebration the
operator opts into, and freezing it leaves confetti stuck mid-fall.