Move breakpoints, fonts, and app_constants into the core directory for better organization:
- Move src/lib/breakpoints.ts to src/core/breakpoints.ts
- Move src/lib/fonts.ts to src/core/fonts.ts
- Move src/core/constants/app_constants.ts to src/core/app_constants.ts and clean up outdated comments
Reorganize project structure by relocating chat-websocket and message-queue modules from `src/integrations/` to `src/core/net/` to better reflect their networking purpose and improve code organization.
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)`.
Introduce AppConstants class to consolidate application-wide
constant values previously scattered across the Dart codebase.
Includes env-aware getters for appTitle and appUrl using
getAppEnv(), with NEXT_PUBLIC_* env overrides for OAuth client IDs
and sensible fallbacks for local development.
admin