feat: Introduce Stop N Go game mode with new managers for phases, missions, and special tiles.

scripts/managers/stop_n_go_manager.gd

@@ -29,7 +29,7 @@ const PERMANENT_POWERUP_LOCATIONS: Array[Vector2i] = [
 ]
 
 var current_phase: Phase = Phase.GO
-var phase_timer: float = 15.0 # Initialized dynamically later
+var phase_timer: float = 20.0 # Initialized dynamically later
 var is_active: bool = false
 
 var player_missions: Dictionary = {} # player_id -> {target_tile: int, required: int, current: int}
@@ -667,16 +667,28 @@ func _scatter_player_tiles(player_node: Node):
 	
 	var peer_id = player_node.name.to_int()
 	var playerboard = player_node.playerboard
-	var tiles_to_scatter: Array[int] = []
 	
-	# Collect all non-empty tiles from playerboard
+	# Collect all non-empty tile indices from playerboard
+	var occupied_indices: Array[int] = []
 	for i in range(playerboard.size()):
 		if playerboard[i] != -1:
-			tiles_to_scatter.append(playerboard[i])
-			playerboard[i] = -1
+			occupied_indices.append(i)
 	
-	if tiles_to_scatter.is_empty():
+	if occupied_indices.is_empty():
 		return # Nothing to scatter
+		
+	# Select up to 3 random tiles to scatter
+	var rng = RandomNumberGenerator.new()
+	rng.randomize()
+	occupied_indices.shuffle()
+	
+	var tiles_to_scatter: Array[int] = []
+	var scatter_count = min(occupied_indices.size(), 3)
+	
+	for i in range(scatter_count):
+		var board_idx = occupied_indices[i]
+		tiles_to_scatter.append(playerboard[board_idx])
+		playerboard[board_idx] = -1 # Remove only the scattered tiles from board
 	
 	# Find valid nearby positions to drop tiles (within radius 3 of player)
 	var center = player_node.current_position
@@ -698,7 +710,6 @@ func _scatter_player_tiles(player_node: Node):
 			valid_drop_positions.append(pos)
 	
 	# Scatter tiles onto valid positions
-	var rng = RandomNumberGenerator.new()
 	rng.randomize()
 	
 	for tile in tiles_to_scatter: