Trigger the action with the given parameters. Returns the response body
on success AND throws on failure — the same error is stored in error
for render-time consumers. Resolves to the discriminated result shape
(see ActionResultForKind<TKind>); when TKind is omitted it resolves
to AnyActionResult, narrowable via "<key>" in r.
Resolves to null (without making a request) when actionId is null
or the SDK is not yet initialized — guard the host-side caller with
if (!actionId) return; if these cases are reachable.
Clear result and error.
Last response, or null before first call and after reset().
Last thrown error, normalized to the public
ActionExecuteErrorshape, ornull.