Prevent multiple submissions by quitting form (bug/submission)

[tran2106]

If a user exits or refreshes mid-vote, they can re-vote.

Disable/hide submit button once a vote is submitted or skipped.

For guests, use localStorage to track polls they’ve interacted with.

For logged-in users, show a message like “You already voted” after first attempt.

[tran2106]

adjust the front end to prevent user going back to vote form after submiting their ballot, including dashboard