Counter each changing origin in a resident BG gather

Hold both physical groups until all required matching responses allow the original movement. Share normal packet denials across gather and ordinary moves, then resume one original movement suffix.

components/game-table.tsx

@@ -2503,6 +2503,14 @@ export function GameTable({
                   {' '}Any already-played movement or declaration card keeps its original use. Choose a legal replacement if matching is prevented.
                 </p>
               )}
+              {g.response.kind==='advisorFlip'&&g.response.advisorGatherMatchingSource&&(
+                <p className="notice">
+                  Gathered group {g.response.advisorGatherMatchingPosition?.current} of {g.response.advisorGatherMatchingPosition?.total}:
+                  {' '}the incoming forces from {territory(g.response.advisorGatherMatchingSource.origin).name} must match your residents.
+                  {' '}Neither origin has moved, changed type or collected spice. Every required group response must allow the same original gather before it moves once.
+                  {' '}Preventing one group leaves both origins and the movement unused, while this prevented packet here remains unavailable. Choose a legal replacement.
+                </p>
+              )}
               {g.response.kind==='advisorFlip'&&g.response.advisorTransportMatchingSource&&(
                 <p className="notice">
                   The incoming transport group must match your residents before payment or force transfer.