Accesibility: improve FocusTrap and MessageProvider#6576
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Closes #6575
Implemented keyboard accessibility fixes for
MessageServicemodals.FocusTrapno longer renders empty focusable sentineldivs; it now uses a provider-agnostic JS focus trap that cycles through real tabbable DOM elements and handles hidden, disabled, details, and radio-group edge cases.MessageProvidernow supportsMessageOptions.CloseOnEscape, treating Escape as Cancel for confirmations.