Reduce bundle size

[obulat]

Description

This PR aims to reduce the bundle size by 'tree-shaking': deep importing of components and css.

Other information

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  visible errors.

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[akmadian]

I'm unsure if Olga's work on this is done, but I'm merging anyways cause we've made great progress, and I'd like to have everything clean when outside contributors come in.

If there's more optimization to be done, we can re-visit in the future.