Allow the owner of a poll to select/deselect options of participants

Describe the goal you'd like to achieve

As a poll owner, I want to be able to select or deselect options/choices of poll participants, because it helps managing the poll result. Sometimes the poll owner negotiates with the participants to find a date that is suitable. Actually only the participant can change his/her selection, so he/she has to log in again to change the selection according to the negotiation/discussion with the organizer. If the Poll owner can change the selection directly, it's easier for the users. After the poll is closed it is clearly visible what has been chosen then.

Describe possible solutions

Create an option switch like "Allow poll owner to change participant's selections". And eventually display this information on the poll page to be transparent.
The poll owner sees the checkboxes of the users/participants editable then.

Additional context

None

Start by locating the poll page and the participant selection controls described in the issue. Trace how participant choices are stored and how poll-owner permissions are checked, then define the setting, its transparency on the poll page, and behavior after closure. Done means an owner can edit participant checkboxes only when enabled, with the resulting selections visible as described.