Here's what it is:

• Mark: One clean isosceles kite with a clipped lower corner — reads as a card caught mid-flip without spelling it out
• Palette: A cool jade accent (#2E8B72) sitting on a deep slate-ink field (#141518)
• Style: Flat, hard-edged, plenty of breathing room, no lettering and no gradients

The icon is already written to resources/branding/appicon.iconset/icon@3x.png and will be picked up on your next build. Want me to run a build to confirm everything compiles cleanly?