palcarazm / component-lifecycle / 24337691215

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feat(events): emit transition-invalid event for invalid state transitions

Emit transition-invalid event when canTransition() returns false,
providing programmatic visibility into attempted invalid state transitions.
The event includes transition details (from, to, component).

Changes:
- Add "transition-invalid" to TransitionEventMap type definition
- Emit event in transitionTo() before early return on canTransition()
- Update JSDoc comments across lifecycle methods (init, attach, dispose,
  destroy)
- Document event in events.md with usage description
- Add comprehensive test coverage with 6 test cases
- Refactor transition-cancelled tests for consistency

Implements #11

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