Polls : display who voted

### Your use case

#### What would you like to do?

On polls, display for each choice who voted (not just the number of votes)

#### Why would you like to do it?

I need to know who voted for what because I will then negotiate with individuals to reach a consensus, or manage hurt feelings. Common use cases : finding a date/time for a meeting, choosing between different strategies, deciding where to go eat lunch (lunch feelings can be hurt)

#### How would you like to achieve it?

Suggested approx UX : (grey box is a tooltip on hover)

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

No file, test, or client entry point is named. Start with the screenshot and the poll display request, then locate the existing poll choice and vote-count UI; done means each choice shows who voted, matching the proposed UX.

Written by the indexing model from the issue text.