* Support info message and fix deprecations
* Cleanup exception code
* Announce model picker notices to screen readers
Addresses PR review feedback:
- Fold the hover's warning and info banners into the model row's
ariaDescription, stripped of markdown and prefixed with severity.
- Use model_relocated for the neutral infoText examples, since
model_pending_deprecation maps to a warning.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
04e0eae362