activate method
Activates the flow id without pausing others. Multiple flows can be running and all receive intents.
Why use it: When you want more than one flow to react (e.g. auth + cart). For a single active flow, use switchTo.
Example: flowManager.activate("authFlow"); flowManager.activate("cartFlow");
Implementation
bool activate(String id) {
final flow = _flows[id];
if (flow == null) return false;
if (flow.state == OmegaFlowState.running) return true;
flow.start();
return true;
}