Closes #10418

Problem

The TUI input area height is hardcoded to a maximum of 8 visual lines:

return min(max(visual_lines, 1), 8)  # cli.py

This makes long prompts feel cramped.

Solution

Add display.input_max_height (default: 8, max: 50) to control the max visual lines.

Config

display:
  input_max_height: 25