fix: UX of the Modules view is very bad

[KonradPietocha]

Description

Changes proposed in this pull request:

• Using Suspense to smooth out renders.
• Small refactoring of the start and mid columns.

Related issue(s)
Closes #3945

Definition of done

• The PR's title starts with one of the following prefixes:
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• Related issues are linked. To link internal trackers, use the issue IDs like backlog#4567
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