Revert "Persist shell navigation in sessionStorage when withRouter is off"

[govindavashishtha]

Reverts #813

---

Note

Medium Risk
Removes navigation persistence and URL isolation for default (non-router) embeds, which may regress reload/share behavior hosts relied on after #813.

Overview
Reverts the sessionStorage-backed shell location feature (#813). When withRouter is false (the default for embeds), shell navigation no longer persists paths and query state in sessionStorage or keeps the host URL clean while mirroring routes internally.

Runtime: Removes ShellLocationProvider, shellLocationStore, ShellStorageRouteSync, and the shared ShellRouteSyncCore wrapper. ShellRouteSync again owns the full react-router bidirectional sync when routes are resolved; without withRouter, there is no route sync bridge and RemoteIdRouteBridge is not wired. Share/session query helpers (useSessionShareSearch, closing sessions) go back to window.location via replaceSessionShareSearch instead of the location store.

Boot / share links: LibrarySessionShareBoot always reads share params from the real URL on mount (no “consume into storage then strip” flow).

Docs: README drops withRouter / routes from the props table; customization docs no longer describe tfy-aui-shell-location or storage-vs-URL behavior.

Tests: Deletes ShellStorageRouteSync coverage and storage cleanup hooks from container/shell-mode tests.

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