BUG: Resizing issue with panels on "Getting Started" demo

[eko3alpha]

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Chrome/Safai/Firefox

Reproducible demo link

https://grapesjs.com/docs/getting-started.html#layers

Describe the bug

**How to reproduce the bug?

Navigate to the GrapesJS Getting Started documentation at this link.
Attempt to resize the layers panel on the right by dragging its left edge.
Notice the drifting behavior of the panel.

What is the expected behavior?
When resizing the layers panel, it should smoothly adjust its width without drifting left or right. The panel's right edge should remain anchored in place while only its width changes.

What is the current behavior?
Upon attempting to resize the layers panel by dragging its left edge, the entire panel starts to drift either to the left or right depending on the direction of resizing. This is not limited to the online demo; the same behavior is observed when setting up GrapesJS locally following the demo's instructions.

Code of Conduct

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