[FEATURE]: Add a max % height and ability to scroll to the question pane (TUI) #18673

Feature hasn't been suggested before.

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Describe the enhancement you want to request

When agents use the question tool with a large body of content, the question pane occupies nearly the entire height of the TUI. The top line remains showing the standard output text and can be scrolled. The question pane needs a maximum size, preferably defined as a configurable percentage of lines (e.g. 50%). This is related to 11014 though that issue focuses on the GUI.

More importantly, the question pane cannot be scrolled at all. If the question content has more lines than the TUI allows, the content simply cannot be seen and in my terminal (wezterm on opensuse with KDE Plasma Wayland), the question cannot be answered at all.

I have identified a single workaround: decrease the font size repeatedly until the full content is viewed. Note that this often makes the text so small that it is entirely unreadable.