MCP elicitation form dialog clipped & not scrollable in fullscreen TUI - action buttons below viewport

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When an MCP server sends an elicitation/create request whose rendered form
exceeds the terminal height, the bottom of the form — including the action
buttons (Accept / Decline / Cancel) — is clipped below the viewport and cannot
be reached. The form dialog is not scrollable, so the user cannot submit or
dismiss it.

This happens in fullscreen TUI mode.
Switching to /tui default resolves it, and resizing the terminal taller also works around it.
That points to the fullscreen / alternate-screen renderer not making elicitation dialogs
scrollable (same class of bug as #51653 and #42670, but for elicitation forms,
which neither issue mentions).

default fullscreen TUI (v2.1.89+ default) reproduces this out-of-the-box

What Should Happen?

The elicitation dialog should scroll (or otherwise stay fully reachable) so the
action buttons are always accessible, regardless of terminal height or TUI mode.

Steps to Reproduce

1. Connect an MCP server that issues an elicitation/create request with a

long message and/or a field with long text (enough to overflow terminal
height).

1. Ensure TUI mode is fullscreen (/tui).
2. Trigger the elicitation.
3. Observe: bottom of the form (action buttons) is cut off; cannot scroll to it.

Claude Code Version

2.1.179

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_