Issue URL: resolves#25866
---------
Docs PR: https://github.com/ionic-team/ionic-docs/pull/2914
<!-- Please refer to our contributing documentation for any questions on
submitting a pull request, or let us know here if you need any help:
https://ionicframework.com/docs/building/contributing -->
<!-- Some docs updates need to be made in the `ionic-docs` repo, in a
separate PR. See
https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#modifying-documentation
for details. -->
<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->
<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->
## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
<!-- Issues are required for both bug fixes and features. -->
NVDA is not announcing toasts on present.
## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
- Toast has a "status" role and "polite" announcement.
- We also revisited the intended behavior of toasts to better align with
the Material Design v2 spec:
https://m2.material.io/components/snackbars/web#accessibility
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->
## Other information
<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->
Dev build: 7.0.3-dev.11681482468.19d7784f
76c8b94e2a