Fix tree-shaking

[mimarz]

We currently have a bug where tree-shaking for vite (and probably webpack) is not working as intended.

We first discovered this issue with new Accordion using @u-elements/details being tree-shaked away and be broken.

This looked to be fixed by removing sideEffect:false, but that only disabled tree-shaking so that all components and its dependencies was bundled along.

We need to further investigate and test remedies to this.

Tasks

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1. Circular dependencies in packages/react #2474
   ⚙️ technical 🕵️ investigate +2
2. Prevent tree-shaking of side-effect imports of @u-elements/* #2477
   react ⚙️ technical 🕵️ investigate +3
   

Notes

• Dicussions in fix: use standard side effects #2469

Notes:
With "sideEffects": false:

Without"sideEffects": false:

With sideEffect:false:

Without:

[mimarz]

Tested with next.34 and its now working as intended.