Add EventBus, SpeedRunManager, and GhostManager; implement ghost recording and playback features

scripts/Events/GhostEventHandler.cs

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+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+[GlobalClass]
+public partial class GhostEventHandler : Node
+{
+    private GhostManager _ghostManager;
+
+    public override void _Ready()
+    {
+        _ghostManager = GetNode<GhostManager>("/root/GhostManager");
+        var eventBus = GetNode<EventBus>("/root/EventBus");
+        
+        eventBus.LevelStarted += OnLevelStarted;
+        eventBus.LevelCompleted += OnLevelCompleted;
+    }
+
+    private void OnLevelStarted(int levelIndex, Node currentScene)
+    {
+        GD.Print($"GhostEventHandler: Level {levelIndex} started.");
+        _ghostManager.StartRecording(levelIndex);
+        _ghostManager.SpawnGhostPlayer(levelIndex, currentScene);
+    }
+    
+    private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+    {
+        _ghostManager.StopRecording(true, completionTime);
+    }
+}

scripts/Events/GhostEventHandler.cs.uid

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+uid://dkqeys6lsf04v

scripts/Events/SpeedRunEventHandler.cs

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+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+[GlobalClass]
+public partial class SpeedRunEventHandler : Node
+{
+    private SpeedRunManager _speedRunManager;
+
+    public override void _Ready()
+    {
+        _speedRunManager = GetNode<SpeedRunManager>("/root/SpeedRunManager");
+        var eventBus = GetNode<EventBus>("/root/EventBus");
+        
+        eventBus.LevelCompleted += OnLevelCompleted;
+    }
+
+    private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+    {
+        _speedRunManager.Split();
+    }
+}

scripts/Events/SpeedRunEventHandler.cs.uid

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+uid://bysxvcvt00t04

scripts/GhostFrame.cs

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+using Godot;
+
+namespace Mr.BrickAdventures.scripts;
+
+public partial class GhostFrame : GodotObject
+{
+    public double Timestamp { get; set; }
+    public Vector2 Position { get; set; }
+}

scripts/GhostFrame.cs.uid

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+uid://d2vth3yveucti

scripts/GhostPlayer.cs

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+using System.Collections.Generic;
+using Godot;
+
+namespace Mr.BrickAdventures.scripts;
+
+[GlobalClass]
+public partial class GhostPlayer : Node2D
+{
+    private List<GhostFrame> _playbackData = [];
+    private double _startTime = 0;
+    private int _currentFrameIndex = 0;
+    private bool _isPlaying = false;
+    
+    public void StartPlayback(List<GhostFrame> playbackData)
+    {
+        _playbackData = playbackData;
+        _startTime = Time.GetTicksMsec() / 1000.0;
+        _currentFrameIndex = 0;
+        _isPlaying = true;
+        SetProcess(true);
+    }
+
+    public override void _PhysicsProcess(double delta)
+    {
+        if (!_isPlaying || _playbackData.Count == 0) return;
+
+        var currentTime = (Time.GetTicksMsec() / 1000.0) - _startTime;
+
+        while (_currentFrameIndex + 1 < _playbackData.Count && _playbackData[_currentFrameIndex + 1].Timestamp <= currentTime)
+        {
+            _currentFrameIndex++;
+        }
+
+        if (_currentFrameIndex + 1 >= _playbackData.Count)
+        {
+            GlobalPosition = _playbackData[_currentFrameIndex].Position;
+            _isPlaying = false;
+            QueueFree();
+            return;
+        }
+        
+        var frameA = _playbackData[_currentFrameIndex];
+        var frameB = _playbackData[_currentFrameIndex + 1];
+        var t = (currentTime - frameA.Timestamp) / (frameB.Timestamp - frameA.Timestamp);
+
+        GlobalPosition = frameA.Position.Lerp(frameB.Position, (float)t);
+    }
+}

scripts/GhostPlayer.cs.uid

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+uid://cr4bfcpo27e7t

scripts/UI/SpeedRunHud.cs

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+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.UI;
+
+[GlobalClass]
+public partial class SpeedRunHud : Control
+{
+    [Export] private Label _timerLabel;
+    
+    private SpeedRunManager _speedRunManager;
+
+    public override void _Ready()
+    {
+        _speedRunManager = GetNode<SpeedRunManager>("/root/SpeedRunManager");
+        
+        _speedRunManager.TimeUpdated += OnTimerUpdated;
+        
+        Visible = _speedRunManager.IsVisible;
+    }
+
+    private void OnTimerUpdated(double totalTime, double levelTime)
+    {
+        _timerLabel.Text = SpeedRunManager.FormatTime(totalTime);
+    }
+}

scripts/UI/SpeedRunHud.cs.uid

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+uid://0jfdx0hufs55