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docs(testing): test native dismissal in the Playwright spec, not play functions (#6474)

* docs(testing): document trusted vs synthetic input for native dismissal

Storybook play functions using @storybook/test's synthetic userEvent cannot
trigger browser-native popover/dialog light-dismiss (Escape, outside/backdrop
click), which requires trusted input. Document using @vitest/browser/context's
real Playwright-backed userEvent for that path, in the storybook-testing style
guide (canonical), the migration-testing skill, and the Phase 6 workflow.

* docs(testing): put native-dismissal tests in the playwright spec, not play functions

* docs(testing): clarify trusted input event assertions

- make the custom-event detail example depend on a documented event contract
- clarify that isTrusted checks belong on native input events

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Co-authored-by: Patrick Fulton <360251+pfulton@users.noreply.github.com>

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