"Undo" forwarding

### Your use case

#### What would you like to do?
[suggestion] don't send when hitting the send button, but when closing the dialogue/window/panel. add ability to "undo" forwarding.

#### Why would you like to do it?
it's easy to forward messages and potentially leak rooms, between spaces etc. yes you can redact things, but not sending erratically should be better.

#### How would you like to achieve it?
like (i believe) gmail's undo sending for example. the timeline could represent this by leaving the message in unsent state or even more greyed out and either remove it when undone or send it upon close.

### Have you considered any alternatives?

_No response_

### Additional context

#17616