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Type shared attr helpers with HasStartEndDuration protocol (#1811)

* Type shared attr helpers with HasStartEndDuration protocol

AI disclosure: used Claude Sonnet 5

Prompt: Fix collective/icalendar#897: the attr.py helpers call Component._get_start_end_duration, which only Event and Todo define. Retype all affected helpers with a structural Protocol; preserve runtime behavior and Event/Todo default semantics.

* Fix failed CI

* Update Vale integration section to use 'IDEs'

* Update Vale integration section to use 'IDEs'

* Replace HasStartEndDuration protocol with Event | Todo union

* Remove unreachable end-value check in get_end_property

* Update news/897.bugfix

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Co-authored-by: Steve Piercy <web@stevepiercy.com>

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