Interactive text input widget.
Manages cursor position, text editing, scroll offset for long text,
and emits on_change/on_submit messages to the parent via _pending.
Props (mount-time only)
:value— initial text value:placeholder— placeholder text when empty:on_change— message tag sent as{tag, new_value}on edit:on_submit— message tag sent as{tag, value}on Enter:max_length— maximum character count (default::infinity):width— display width:id— element id (required for focus):cursor_style—:block|:underline|:bar(default::block):focused_bg— background color when focused:focused_fg— foreground color when focused:placeholder_fg— foreground color for placeholder text:cursor_fg— foreground color for cursor cell:cursor_bg— background color for cursor cell