Back / Esc per surface

Step diagram

User triggers back
User
Hardware back on Android, swipe-back on iOS, browser back on web, or Esc on desktop.
KoderBackScope intercepts
SDK
Single intent handler shared by every surface; no per-screen workarounds.
Pop one route
App
Navigation stack pops exactly one entry. Never an unrelated tab switch, never two pops at once.
User reaches the root
User
Stack is now down to one entry — the root screen.
Next back exits the app
SDK
Configurable: enableSystemExitAtRoot=true closes the app; otherwise back at root is a no-op (often desktop windows).

Re-implementing back per screen — every screen ends up with a slightly different rule and the user can't predict the result.
Mapping back to logout — silently drops auth state when the user expected to navigate.