Added intro video

src/core/application/ApplicationManager.h

@@ -153,6 +153,11 @@ private:
     float m_logoAnimCounter = 0.0f;
     bool m_helpOverlayPausedGame = false;
 
+    // Intro video playback (in-process via FFmpeg)
+    bool m_introStarted = false;
+    std::string m_introPath = "assets/videos/spacetris_intro.mp4";
+    std::unique_ptr<class VideoPlayer> m_videoPlayer;
+
     // Gameplay background (per-level) with fade, mirroring main.cpp behavior
     SDL_Texture* m_levelBackgroundTex = nullptr;
     SDL_Texture* m_nextLevelBackgroundTex = nullptr; // used during fade transitions