Fix #25460: Infinite loop when moving track design ghost queue over queue loop (#25893)

Added iteration limit to FootpathChainRideQueue based on map size (10x total tiles) as a safeguard against circular queue scenarios possible with zero clearance checks.

distribution/changelog.txt

@@ -4,6 +4,7 @@
 - Change: [#25962] The station style dropdown now shows entrance icons next to the labels for easier selection.
 - Change: [#26178] Symmetric spinning trains and legacy ‘pre-reversed’ trains can no longer be reversed.
 - Fix: [#10616] Quarter-tile trees cannot be placed on dry portions of half-water tiles.
+- Fix: [#25460] Infinite loop when moving track design ghost queue over queue loop with zero clearances.
 - Fix: [#25735] Ride synchronisation z-check works incorrectly.
 - Fix: [#25962] Dropdown triangle glyphs are not optically centred.
 - Fix: [#25993] Toggling “allow arbitrary ride type changes” does not resize open ride windows.

src/openrct2/world/Footpath.cpp

@@ -803,8 +803,17 @@ namespace OpenRCT2
         int32_t baseZ = tileElement->GetBaseZ();
         int32_t lastPathDirection = direction;
 
+        // Prevent infinite loops from circular queues (possible with zero clearance checks)
+        auto& gameState = getGameState();
+        const int32_t maxIterations = gameState.mapSize.x * gameState.mapSize.y * 10;
+        int32_t iterations = 0;
+
         for (;;)
         {
+            if (++iterations > maxIterations)
+            {
+                break;
+            }
             if (tileElement->GetType() == TileElementType::Path)
             {
                 lastPathElement = tileElement;