Not sure. I think they are -0.5 over the Seagulls. With home field advantage that is essentially the Seahawks favoured in that game because home team usually gets 2.5 in close games. So Seahawks might still be favoured for 1 seed.

Edit: Looks like polymarket has it 49% seahawks 48% 49ers but it is a pretty low liquidity market by their standards.