Andrew Scott
84a210e8f3
Introduces support for route-level resources via the `resources` property on route definitions, enabled with `withRouterResources()`. Router resources provide a reactive, signal-based alternative to resolvers, allowing routes to declare resources tied to route parameters and route lifecycle: - The `resources` function executes during navigation transitions within an injection context scoped to the route (`_localInjector`). - It receives a `ResourceContext` containing signals for `params`, `queryParams`, `fragment`, and `data`, alongside the static `snapshot`. - For newly created routes, `resources` runs once and attaches to `ActivatedRoute.resources`. For reused routes, parameter signals update reactively to trigger new data fetches while keeping resource references stable. - Wrapped resources (`routerResource`) provide transactional stability: snapshots are frozen during active navigations to prevent UI jitter, unfreezing on `NavigationEnd`. - On cancelled navigations or errors, rollback recovery retains the frozen snapshot until reverted signals settle, avoiding flashes of loading state. Manual reloads are rejected while frozen. - Local injectors are automatically cleaned up if navigations are cancelled or rolled back. Note that this commit only implements non-blocking resources (marked with `nonBlocking()`), deferring blocking resource resolution to future work to keep the initial changeset smaller and less complex. PR Close #70211
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