palcarazm / component-lifecycle / 24336076666

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feat: emit transition-cancelled event when lifecycle hooks cancel transitions

Implement cancellable lifecycle transitions that allow async hooks to
reject state changes. When doInit(), doAttach(), doDispose(), or doDestroy()
return { cancelled: true }, the component remains in its current state and
emits a transition-cancelled event with from/to states and optional reason.

Major changes:
- Add TransitionEventDetails and TransitionEventMap types for transition events
- Add BaseEventMap as union of LifecycleEventMap and TransitionEventMap
- Refactor transitionTo() into executeTransition() helper to eliminate duplication
- Emit transition-cancelled event with component, from, to, reason payload
- Add 7 comprehensive tests covering all cancellation scenarios
- Update documentation to explain transition-cancelled event behavior
- Enhance DummyComponent test helper to support optional cancellation reasons

Implements #10

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