feat(frontend): display winners at end of round

[mlevi15]

Proposed Changes

Displays the winner info for 10 seconds at the end of the round.

Just a simple dialog for now. We'll probably want to spice up the styling at some point and highlight the winner or something. We still need to implement showing everyone's cards at the end of the round as well.

https://www.loom.com/share/f7de5915c13544509b35f953a25b8c2f

Linked Issue

resolves #228

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Merge Checklist

• [x] My code follows the code style of this project.
• [x] All new and existing tests passed.
• [x] Any dependent changes have been merged in downstream modules.
• [x] I have provided inline technical documentation (tsdocs) where necessary.
• [ ] My change requires a change to the root documentation.
• [ ] I have updated the documentation accordingly.