File / folder deletion warning should be more scary

Description

For now, when the user deletes a file or a folder, we "only" display a snackbar to confirm the deletion.

We should use a BottomSheetDialog instead to really break the user mental navigation and make it more clear that this operation will be unrecoverable.

We had a report of somebody that has deleted her whole photo directory that way by error.

Screenshot / video

Some examples on other apps

Amaze:

Google Files:

App mode

Smartphone

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