refactor(webapp): remove redundant React fragments

[carderne]

Summary

Remove redundant React fragments from the dashboard and enforce react/jsx-no-useless-fragment.

The cleanup returns existing nodes, arrays, and empty states directly without adding wrapper elements.

Base: #4689

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Latest commit: 4c4e216

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commit: 4c4e216

[devin-ai-integration]

Devin Review found 2 new potential issues.