feat: add eSceneType enum, filter scene graph to general scenes, zone parsing improvements

- Add eSceneType enum (General, Audio) replacing raw uint32_t in SceneRef
- Filter BuildSceneGraph to only include General scenes
- Skip transitions referencing non-general scenes in adjacency graph
- Rename SceneRef unknown fields to scenePosition/sceneRadius
- Zone parsing and Level improvements

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dZoneManager/Level.h

@@ -4,6 +4,67 @@
 #include <iostream>
 #include "Zone.h"
 
+struct LvlDrawDistances {
+	float fogNear{};
+	float fogFar{};
+	float postFogSolid{};
+	float postFogFade{};
+	float staticObjDistance{};
+	float dynamicObjDistance{};
+};
+
+struct LvlCullVal {
+	uint32_t groupID{};
+	float min{};
+	float max{};
+};
+
+struct LvlLightingInfo {
+	float blendTime{};
+	float ambient[3]{};
+	float specular[3]{};
+	float upperHemi[3]{};
+	NiPoint3 position;
+	bool hasDrawDistances{};
+	LvlDrawDistances minDraw;
+	LvlDrawDistances maxDraw;
+	std::vector<LvlCullVal> cullVals;
+	float fogNear{};
+	float fogFar{};
+	float fogColor[3]{};
+	float dirLight[3]{};
+	NiPoint3 startPosition;
+	NiQuaternion startRotation = QuatUtils::IDENTITY;
+	bool hasSpawn{};
+};
+
+struct LvlSkydomeInfo {
+	std::string filename;
+	std::string skyLayerFilename;
+	std::string ringLayer[4];
+};
+
+struct LvlEditorColor { float r{}, g{}, b{}; };
+
+struct LvlEditorSettings {
+	std::vector<LvlEditorColor> savedColors;
+};
+
+struct LvlEnvironmentData {
+	LvlLightingInfo lighting;
+	LvlSkydomeInfo skydome;
+	LvlEditorSettings editor;
+	bool hasEditor{};
+};
+
+struct LvlParticle {
+	uint16_t priority{};
+	NiPoint3 position;
+	NiQuaternion rotation = QuatUtils::IDENTITY;
+	std::string effectNames;
+	LwoNameValue config;
+};
+
 class Level {
 public:
 	enum ChunkTypeID : uint16_t {
@@ -39,15 +100,23 @@ public:
 
 public:
 	Level(Zone* parentZone, const std::string& filepath);
-	
+
 	static void MakeSpawner(const SceneObject& obj);
 
 	std::map<uint32_t, Header> m_ChunkHeaders;
+	LvlEnvironmentData m_Environment;
+	bool m_HasEnvironment{};
+	std::vector<LvlParticle> m_Particles;
 private:
 	Zone* m_ParentZone;
 
 	//private functions:
 	void ReadChunks(std::istream& file);
 	void ReadFileInfoChunk(std::istream& file, Header& header);
+	void ReadEnvironmentChunk(std::istream& file, Header& header);
+	void ReadLighting(std::istream& file, uint32_t version);
+	void ReadSkydome(std::istream& file, uint32_t version);
+	void ReadEditor(std::istream& file);
 	void ReadSceneObjectDataChunk(std::istream& file, Header& header);
+	void ReadParticleChunk(std::istream& file, Header& header);
 };