Refactored the handling of email suggestions to separate selection
and commitment logic. Updated `<DxListBox>`'s `ValueChanged`
handler to use `OnReceiverEmailSuggestionCommittedAsync` for
finalizing selections. Introduced `SelectReceiverEmailSuggestion`
as a synchronous helper method for managing selection updates.
Centralized clearing of suggestions in the new
`OnReceiverEmailSuggestionCommittedAsync` method. Simplified
keyboard navigation logic by replacing asynchronous calls with
synchronous selection handling. These changes improve code
clarity and reduce unnecessary asynchronous operations.
TekH
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