Fixed lint prop-types warnings; moved comments

[bzzz-coding]

Description

• Updated Loader component declaration with proptypes following const App = ({ message }: AppProps) => <div>{message}</div>; format.

• Moved comments on props to interface

Related Issues

Resolves #633

Testing

• Ran ci:lint, no more prop-types warnings.

Checklist

• [x] I have followed all conventions outlined in our documentation.
• [x] I have fully tested my changes and confirmed that all new and existing tests pass.
• [x] I have written meaningful commit messages for all changes.
• [x] I have linted and formatted my changes to follow the code style of this repository.
• [x] I have updated our documentation, accordingly.
• [x] I have checked currently opened pull requests to ensure that there are no pending pull request for the same changes or issues.
• [x] I have confirmed that this pull request fully meets the acceptance criteria for all related issues listed above.

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