Replay: deterministic record & playback (#4)

Add deterministic record/playback for a run.

Recording captures `(seed, config hash, ordered tick-tagged commands)` and re-simulates on playback — no state snapshots. `DotaFactory.exe --replay <file>` re-plays a recorded run view-only with manual speed/pause.

Reviewed-on: #4
Co-authored-by: Malte Langkabel <malte.langkabel@gmail.com>
Co-committed-by: Malte Langkabel <malte.langkabel@gmail.com>

src/ui/MainWindow.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -17,6 +18,7 @@
 #include "Tick.h"
 #include "VisualsConfig.h"
 
+struct ParsedReplay;
 class Simulation;
 class GameWorldView;
 class HeaderBar;
@@ -37,7 +39,8 @@ class MainWindow : public QWidget,
     Q_OBJECT
 
 public:
-    MainWindow(Simulation* sim, const std::string& configDir, QWidget* parent = nullptr);
+    MainWindow(Simulation* sim, const std::string& configDir,
+               std::shared_ptr<ParsedReplay> replay = nullptr, QWidget* parent = nullptr);
     ~MainWindow() override;
 
 protected:
@@ -65,4 +68,5 @@ private:
     QWidget*               m_sidePanel;
 
     std::vector<ShipLayoutBlueprint> m_layoutBlueprints;
+    std::shared_ptr<ParsedReplay>    m_replay;  // non-null => view-only playback
 };