Function is_vote_state_unsupported_error 

pub fn is_vote_state_unsupported_error(error: &AurVoteError) -> bool

What: Determine whether a vote-state error indicates unsupported upstream command.

Inputs:

• error: Typed vote error returned by aur_vote_state.

Output:

• true if the upstream SSH endpoint rejected list-votes as invalid.

Details:

• Used by UI event-loop mapping to degrade gracefully to Unknown instead of showing persistent inline errors for unsupported read-only lookups.