feat: Introduce an enhanced gridmap addon with procedural generation, pathfinding, and initial core game scripts and assets.

scenes/player.gd

@@ -559,9 +559,10 @@ func receive_spawn_positions_update(occupied_positions: Array):
 		if pos in occupied_positions:
 			highlighted_spawn_points.erase(pos)
 			if enhanced_gridmap:
+				# Clear the highlight from Layer 2 (Overlay) instead of overwriting Floor 0
 				enhanced_gridmap.set_cell_item(
-					Vector3i(pos.x, 0, pos.y),
-					enhanced_gridmap.normal_items[0]
+					Vector3i(pos.x, 2, pos.y),
+					-1
 				)
 	
 	# Now highlight available positions
@@ -1141,11 +1142,10 @@ func clear_spawn_highlights():
 	# Clear the highlighted spawn points array
 	for spawn_pos in highlighted_spawn_points:
 		if enhanced_gridmap:
-			# Reset the cell to its original state
-			var cell_item = enhanced_gridmap.get_cell_item(Vector3i(spawn_pos.x, 1, spawn_pos.y))
+			# Clear Layer 2 (Overlay Highlight) instead of potentially overwriting Layer 0
 			enhanced_gridmap.set_cell_item(
-				Vector3i(spawn_pos.x, 0, spawn_pos.y),
-				enhanced_gridmap.normal_items[0] if cell_item != -1 else -1
+				Vector3i(spawn_pos.x, 2, spawn_pos.y),
+				-1
 			)
 	
 	# Clear the array
@@ -1662,11 +1662,11 @@ func notify_spawn_selected(spawn_pos: Vector2i):
 	if spawn_pos in highlighted_spawn_points:
 		highlighted_spawn_points.erase(spawn_pos)
 		
-	# Clear highlight for the selected position
+	# Clear highlight for the selected position on Layer 2 (Overlay)
 	if enhanced_gridmap:
 		enhanced_gridmap.set_cell_item(
-			Vector3i(spawn_pos.x, 0, spawn_pos.y),
-			enhanced_gridmap.normal_items[0]
+			Vector3i(spawn_pos.x, 2, spawn_pos.y),
+			-1
 		)
 
 # Disabled, auto put activated