chore: ignore bunx-* temp dirs

[arthrod]

Adds bunx-* to .gitignore so the temp directory created by bunx skiller@latest during pnpm install is not tracked.

https://claude.ai/code/session_01N2ZqNsNVyfNWbdZgwxM1VM

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[gemini-code-assist]

Code Review

This pull request completes a major refactor of the @platejs/pagination package, transitioning from a document-mutating engine to a pure, derived-layout pipeline that leverages @chenglou/pretext for accurate text measurement. It introduces a React-based overlay host, new chrome rendering components, and a registry-based layout invalidation system. The review feedback provides critical improvements, including correctly overriding editor.apply for layout invalidation, adding safety guards for layout calculations, fixing default option handling in chrome components, and optimizing ResizeObserver usage to avoid redundant computations.

[gemini-code-assist]

Overriding transforms.apply (which maps to editor.tf.apply) will not intercept core Slate operations, as Slate applies operations by calling editor.apply directly. This means the layout registry will never be invalidated on content edits, preventing the pagination from recomputing when the user types or modifies the document. To fix this, editor.apply should be overridden directly on the editor instance.

Suggested change

	}).overrideEditor(({ editor, tf: { apply } }) => ({
	transforms: {
	apply(operation) {
	if (shouldInvalidateLayout(operation)) {
	invalidateLayoutRegistry(editor);
	}
	apply(operation);
	},
	},
	}));
	}).overrideEditor(({ editor }) => {
	const { apply } = editor;
	editor.apply = (operation) => {
	if (shouldInvalidateLayout(operation)) {
	invalidateLayoutRegistry(editor);
	}
	apply(operation);
	};
	return editor;
	});

[gemini-code-assist]

The calculations for contentWidthPx and bounds.height do not guard against negative or zero values. If the configured margins or chrome heights exceed the page dimensions, this can lead to invalid layout states or potential infinite loops during block placement. It is safer to wrap these calculations in Math.max(0, ...).

Suggested change

	const contentWidthPx = page.widthPx - margins.leftPx - margins.rightPx;
	const bounds: Rect = {
	x: margins.leftPx,
	y: margins.topPx + headerHeightPx,
	width: contentWidthPx,
	height:
	page.heightPx -
	margins.topPx -
	margins.bottomPx -
	headerHeightPx -
	footerHeightPx,
	};
	const contentWidthPx = Math.max(0, page.widthPx - margins.leftPx - margins.rightPx);
	const bounds: Rect = {
	x: margins.leftPx,
	y: margins.topPx + headerHeightPx,
	width: contentWidthPx,
	height: Math.max(
	0,
	page.heightPx -
	margins.topPx -
	margins.bottomPx -
	headerHeightPx -
	footerHeightPx
	),
	};

[gemini-code-assist]

There is a subtle bug in the default options handling of PageNumberWithTitle. If a caller passes an empty object {} as the second argument, opts.skipFirstPage will resolve to undefined (falsy), which bypasses the intended default of true. Destructuring the options object with a default value of true ensures robust fallback behavior.

export const PageNumberWithTitle =
  (title: string, { skipFirstPage = true }: { skipFirstPage?: boolean } = {})
  (ctx: ChromeRenderContext): React.ReactNode => {
    if (skipFirstPage && ctx.pageIndex === 0) return null;

[gemini-code-assist]

The ResizeObserver callback is triggered automatically on mount when observation starts. This marks the layout registry dirty and triggers a state update (forceRecompute), causing a redundant second layout computation on mount. Tracking the last observed width and height in local variables and only triggering the recompute when the dimensions actually change will eliminate this overhead.

    useEffect(() => {
      const editable = editor.api.toDOMNode(editor);
      if (!editable || typeof ResizeObserver === 'undefined') return;

      let prevWidth = editable.clientWidth;
      let prevHeight = editable.clientHeight;

      const observer = new ResizeObserver(() => {
        const width = editable.clientWidth;
        const height = editable.clientHeight;
        if (width !== prevWidth || height !== prevHeight) {
          prevWidth = width;
          prevHeight = height;
          invalidateLayoutRegistry(editor);
          forceRecompute((n) => n + 1);
        }
      });
      observer.observe(editable);

      return () => observer.disconnect();
    }, [editor]);