feat: Implement core game managers, player movement logic, and initial UI scenes.

scripts/managers/playerboard_manager.gd

@@ -54,6 +54,10 @@ func grab_item(grid_position: Vector2i) -> bool:
 	if not player.is_multiplayer_authority():
 		return false
 
+	# Play pickup animation
+	if player.has_method("play_pickup_animation"):
+		player.play_pickup_animation()
+
 	# === Optimistic Local Update (immediate visual feedback) ===
 	# Apply changes locally first, server will validate/sync
 	enhanced_gridmap.set_cell_item(cell, -1) # Remove item visually immediately
@@ -82,7 +86,9 @@ func grab_item(grid_position: Vector2i) -> bool:
 	if multiplayer.is_server():
 		# HOST/SERVER: Broadcast to all clients
 		main.rpc("sync_grid_item", cell.x, cell.y, cell.z, -1)
-		player.rpc("sync_playerboard", player.playerboard)
+		# Use main's RPC which properly looks up player by ID on each client
+		var peer_id = player.get_multiplayer_authority()
+		main.rpc("sync_playerboard", peer_id, player.playerboard)
 		player.has_performed_action = true
 		player.consume_action_points(1)
 		player.rpc("force_action_state_none")
@@ -138,13 +144,17 @@ func _execute_grab(grid_pos: Vector2i, cell: Vector3i, item_id: int):
 	player.playerboard[target_slot] = item_id
 	
 	# 3c. Broadcast the new playerboard state to all clients
-	player.rpc("sync_playerboard", player.playerboard)
+	var peer_id = player.get_multiplayer_authority()
+	main.rpc("sync_playerboard", peer_id, player.playerboard)
 	
-	# 3d. Consume action points
+	# 3d. Check if goal is completed (SERVER-SIDE - this triggers goal regeneration for clients!)
+	_check_goal_completion()
+	
+	# 3e. Consume action points
 	player.has_performed_action = true
 	player.consume_action_points(1)
 	
-	# 3e. Reset the UI for the player who acted
+	# 3f. Reset the UI for the player who acted
 	player.rpc("force_action_state_none")
 	
 	return true
@@ -306,6 +316,10 @@ func auto_put_item() -> bool:
 	var cell = Vector3i(target_pos.x, 1, target_pos.y)
 
 	if player.is_multiplayer_authority():
+		# Play put animation
+		if player.has_method("play_put_animation"):
+			player.play_put_animation()
+		
 		# === Optimistic Local Update (immediate visual feedback) ===
 		enhanced_gridmap.set_cell_item(cell, item) # Add item to grid visually immediately
 		player.playerboard[put_slot] = -1 # Remove from playerboard immediately
@@ -627,6 +641,10 @@ func _check_goal_completion():
 		if powerup_manager:
 			powerup_manager.add_goal_completion_reward()
 		
+		# Trigger screen shake for goal completion
+		if player.is_multiplayer_authority() and player.has_method("trigger_screen_shake"):
+			player.trigger_screen_shake("goal")
+		
 		# Notify GoalsCycleManager for scoring
 		var main = player.get_tree().get_root().get_node_or_null("Main")
 		if main: