feat: add icon to indicate capture with caption

[sultanmyrza]

┆Issue is synchronized with this Asana task by Unito
┆Created By: Tammy Yang

[sultanmyrza]

Current implementation looks like this (demo).
The current, implementation has 2 Issues!

1. (Not reactive) With the current implementation users always need to refresh the page to see if the caption icon is updated.
2. (Not optimal) for every item I call diaBackendAssetRepository.fetchByProof$ to get DiaBackendAsset and then I get the caption aka map(asset => asset.caption !== '')

Is there a better way to get a caption for capture?

[shc261392]

I think the current approach is acceptable so I'll accept this pull request. We can optimize it further in the future.