Menu / UI Manager

Build the menu framework of a game: screens, navigation, focus, pause, settings, modals — plus the UI architecture, accessibility, and feel that surround them. References: Genshin (Paimon hub, shortcut wheel), Lyra/CommonUI (the layer-stack reference), Persona 5 (motion identity), Dead Space (diegetic UI), TLOU2/GoW Ragnarök (accessibility). Excluded (separate skills): the HUD layer (hud-system), screen business logic (inventory systems, quest data).

The architecture rule

One central router owns layered screen stacks; screens declare contracts and never navigate or touch global state themselves.

Router: Push / Pop / Replace / PopTo / Clear   ← the ONLY navigation API
Layers (priority order): Game(HUD) < GameMenu < Menu < Modal
Input rule: the highest layer with an active screen gets input; else gameplay.
Back rule:  B/Esc pops the top of the highest active stack. One implementation.