Plugin text fields can be multi-line with a new rows option

What

Plugins can draw their own small forms inside Claude Code. The text input in those forms was a single line. It now accepts an optional rows setting.

• rows must be a whole number of 1 or more. Any other value is rejected with an error such as "rows must be a whole number, 1 or more".
• With 2 or more rows, the field is multi-line. Enter submits, Shift+Enter types a new line, and the hint shows · shift+⏎ new line or \⏎ new line.
• Long text wraps instead of being cut off.
• The up and down arrows now step through input history (onHistoryUp, onHistoryDown).
• The field is no longer described as "A one-line text field".
• The <Input> element now lists rows among its allowed props. The validation error now reads 'Input props must be { key } and any of label, placeholder, value, submitLabel, rows, autoFocus'.

Why

Plugin authors can now ask for longer, multi-line answers. Nothing changes for a plugin that does not set rows.