Add command-line parameter or TUI toggle so that TUI hidden output is shown to user when needed #730

When I run shell commands (bang prefixed), sometimes the output is truncated and the message:

[Preview only: additional text hidden from the TUI.]

is shown.

When I'm debugging (e.g: while configuring sandbox profiles for tau), it is useful to know what is the hidden content

I can see the full output if I export the session and open it in the browser but those are additional steps.

Imho, ideally there would be a [show more] toggle next to the error message to show the full output (or a keyboard shortcut to do the same).
Passing a parameter to the tau command upon launch works too.

tau version: 0.4.1, on macos 15.7.9