Module router 

Scoped stack-based routing utilities for shard components.

Each #[shard] function generates a *Destination type that implements RouterDestination. Destinations are stored in a per-scope LIFO stack.

Responsibilities

• Maintain an ordered stack (route_stack) of active destinations.
• Expose push/pop/replace/reset helpers for scoped navigation.
• Host scope/route shard states inside the router instance.
• Trigger route-scoped shard-state cleanup when routes are discarded.

Structs

RouterController

Reactive navigation controller for one shard tree.

Traits

RouterDestination

A navigation destination produced by the #[shard] macro.