Method pageScroll

packages/pi-tui/src/components/editor.ts:1923–1933

* Scroll by a page (direction: -1 for up, 1 for down). * Moves cursor by the page size while keeping it in bounds.

(direction: -1 | 1)

	 * Moves cursor by the page size while keeping it in bounds.
	 */
	private pageScroll(direction: -1 | 1): void {
		this.lastAction = null;
		const terminalRows = this.tui.terminal.rows;
		const pageSize = Math.max(5, Math.floor(terminalRows * 0.3));

		const visualLines = this.buildVisualLineMap(this.lastWidth);
		const currentVisualLine = this.findCurrentVisualLine(visualLines);
		const targetVisualLine = Math.max(0, Math.min(visualLines.length - 1, currentVisualLine + direction * pageSize));

		this.moveToVisualLine(visualLines, currentVisualLine, targetVisualLine);
	}

	private moveWordBackwards(): void {
		this.lastAction = null;