openai/gpt-5.3-chat → B (1:4)

Side B fixes real behavior: it stops an incorrect fallback to all items when the sibling pool is too small (now returns None), correctly threads delegate_opt through RPC instead of embedding it in text, and simplifies/clarifies routing by renaming /vote/compare to /vote with corresponding test updates. Side A is a minor UI/layout tweak (moving the view counter into the nav and removing fixed positioning) with limited lasting impact.