Monotonically-increasing mount token. The dispatcher writes this to UI::FormState.current_mount_token on every screen mount so the renderer's stale-callback guard fires correctly.

Resolve + dispatch an action_ref. Builds a fresh Native context with the dispatcher's current FormState + the explicit params from the action_ref's button. Runs before_actions on the resolved controller class; if any returns a UI::ActionResult, the dispatch short-circuits. Otherwise calls dispatch_action and translates the returned result via translate_result.

Called when a new screen mounts. Increments the mount token AND creates a new FormState carrying that token. Renderer callbacks captured under the prior token become no-ops (Codex finding #3).

Initial form-state values are seeded from the route's params hash (e.g. a :detail route's :id => "42" ends up as form_state["id"] == "42") — convenient for screens that need to know which row they're showing without the controller pre-pop'ing.

The route argument is the route being mounted. The caller is responsible for ensuring that this matches what the coordinator will publish (the dispatcher's internal translate_result does mount-then-notify to guarantee the renderer's wire-time read of UI::FormState.current sees the NEW mount).

Convenience overload that resolves the route from the coordinator (the route_id is asserted to match the coord's current route). Useful for #mount_screen(route_id) callers that have already pushed the route onto the coord and want to mount based on it.

Optional callback for UI::ActionResult::RenderInline results. The host (macOS / iOS) wires this on startup to present the inline view (e.g. sheet, popover) without disturbing the navigation stack.

Optional callback for UI::ActionResult::RenderInline results. The host (macOS / iOS) wires this on startup to present the inline view (e.g. sheet, popover) without disturbing the navigation stack.