Implement Like and Bookmark system

Allow users to like and bookmark code snippets. Display the highlight of liked and bookmarked for each snippet, and provide real-time updates for new interactions.

## Expectations

- Users can like and bookmark code snippets.
- Liked and bookmarked snippets by the current user are highlighted.
- Real-time updates are shown.

The issue names no files or tests; start by locating the snippet UI and its Redux state in the TypeScript React frontend. Verify how likes, bookmarks, highlighting, and real-time interaction updates should be represented, then confirm completion by checking each expectation in the running app.

Written by the indexing model from the issue text.