fix(positioning-portal): replace findDOMNode with ref

[JacopoBonta]

This pull request refactors the PositioningPortal component to improve how it references its parent DOM node. Instead of using ReactDOM.findDOMNode, which is discouraged in modern React, it now uses a ref attached directly to a wrapping div. This change is implemented across the TypeScript source, the compiled JavaScript, and the legacy build.

Component refactoring:

• Replaced all instances of ReactDOM.findDOMNode(this) with this.parentRef.current to reference the parent DOM node, and introduced a new parentRef using React.createRef. This makes the code more robust and future-proof, as findDOMNode is deprecated in React's strict mode. (src/components/PositioningPortal.tsx, lib/index.js, lib/legacy/index.js/index.js) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Build and documentation updates:

• Updated the Storybook build artifacts and project metadata to reflect the current build environment and dependencies. (docs/iframe.html, docs/project.json) [1] [2]

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@webholics this should address the issue with deprecated findDOMNode without having to upgrade to react-19, do you think is it possible to integrate? I've tested the changes with storybook and everything looks fine