request_item_authority and release_item_authority were always sent as
an RPC to peer 1, even when the caller already WAS peer 1 (the host's
own player). Godot rejects rpc_id() targeting your own peer id ("RPC on
yourself is not allowed by selected mode"), so every host-side grab or
release was silently failing to run its server-side half: no denial
check on grab, and — the more damaging part — no
_try_snap_into_station()/_release_from_snap_zones() call on release,
leaving a station's snap zone holding a stale reference once the host
picked something back up. That's what made the host "no longer able to
interact" with an item after a client had handled it.
Split each entry point into a public function that runs the logic
directly when we're already the server, and a private @rpc handler used
only when an actual remote client calls it. force_release_item gets the
same treatment for the symmetric case (server rejecting its own grab
attempt).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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