Compose modular tab navigation

Build a shell with catalog and profile tabs without creating router subclasses in either feature.

1. Export feature Modules

Each feature declares Destination and Route Definition types, then exports a NavigationModule. It knows neither the shell Scope nor the final URI prefix.

2. Define the Scope tree

Create a shell Scope and two child Scopes. Give each child an explicit restoration identifier.

3. Mount the Modules

The application mounts catalog and profile Modules into their child Scopes and assigns distinct URI prefixes. Reusing a Module in another app only changes Mount configuration.

4. Render the branch

The shell page contains NavigationActiveOutlet(parentScopeId: shellScopeId). Ark Navigation renders the active child Navigator with its retained stack.

5. Switch and reset intentionally

Use activateBranch to change tabs. Use resetBranch only when business lifecycle ends—for example, after sign-out. Inactive tabs are not cleared implicitly.