- Splash Skip button now dispatches `AuthGuestLoginSubmitted` instead of
direct routing, keeping guest auth under the state machine
- Update PWA install dialog copy ("Add to Home Screen") and drop favicon
entry from manifest icons
- Add debug logging and routing sequence docs to splash-button
- Drop AuthGate/AuthGateState re-exports from @/lib/auth/nextauth
- Simplify SplashButton by removing skipHref prop and hardcoding ROUTES.chat
- Update comments to reference useSession() (next-auth/react) directly instead of the AuthGate wrapper, since the auth UI gate no longer needs the extra abstraction layer.
Migrate from function-based social login helpers (`facebookLogin`, `googleLogin`)
to class-based services (`new FacebookLogin().signIn()`, `new GoogleLogin().signIn()`),
updating call sites in `AuthFacebookPanel` and `SplashButton` with try/catch error
handling. The NextAuth route handler is also refactored to the v4 pattern, importing
pre-built `GET` / `POST` exports from `@/lib/auth/nextauth` instead of constructing
the handler inline with `NextAuth(authOptions)`.
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