* Add support for an explicit dismiss button to snackbar, as well as an onDismiss callback
* Fix effect dependencies
* Fix disabling auto-dismiss when explicit dismissing is on, fix cursor styles
* fix noops and dismiss on action
* refactor action click handler
* rename dismiss button class
* increase CES modal placeholder z index
* white. space.
Co-authored-by: Rebecca Scott <me@becdetat.com>
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