FEAT: Undo send (configurable delay window)

[andrinoff]

Is your feature request related to a problem?

Once sent, a message cannot be recalled even seconds later.

Describe the solution you'd like

Hold outgoing mail for a configurable delay (e.g. 10s) with an 'undo' affordance before actually sending.

Describe alternatives you've considered

Scheduled send only.

Additional context

Buffer in the send path (sender/sender.go) with a toast/undo action in tui/.

[floatpanebot]

Thanks for the suggestion!

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[floatpanebot]

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