feat: highlight active mutation and version switch (DAP-4814)

[Lisofffa]

1. Highlight the active mutation with a blue background
2. Add a version switcher to the active mutation (Just transfer the layout from the current one - from the bangs)
3. Do not add versions to inactive mutations

[github-actions]

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Commit	3365a98
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Extension Build	https://github.com/dapplets/mutable-web-monorepo/suites/32394660024/artifacts/2357443210

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Commit	f273911
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Extension Build	https://github.com/dapplets/mutable-web-monorepo/suites/32441768065/artifacts/2362113553

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Commit	16b5b76
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Extension Build	https://github.com/dapplets/mutable-web-monorepo/suites/32462233280/artifacts/2364044528

[alsakhaev]

Why do you return empty <span> instead of null like above?