Method handlePageKey

internal/tui/prompt.go:127–143

handlePageKey implements PgUp/PgDn. textarea disables its viewport keymap, so page keys aren't wired, so we translate them to N×CursorUp/CursorDown (one visible page, letting the viewport scroll to match), then snap out of any chip the move landed inside so the cursor never renders mid-label.

(msg tea.KeyMsg)

// visible page, letting the viewport scroll to match), then snap out of any
// chip the move landed inside so the cursor never renders mid-label.
func (p promptInput) handlePageKey(msg tea.KeyMsg) (bool, promptInput) {
	var step func()
	switch msg.Type {
	case tea.KeyPgUp:
		step = func() { p.ta.CursorUp() }
	case tea.KeyPgDown:
		step = func() { p.ta.CursorDown() }
	default:
		return false, p
	}
	n := max(p.ta.Height(), 1)
	for range n {
		step()
	}
	p.snapCursorOutOfChip()
	return true, p
}

// snapCursorOutOfChip snaps a cursor sitting strictly inside a chip to the
// nearer boundary. Returns the (possibly adjusted) offset so callers skip a