Add diagnostics for invisible creatures and update shadow signatures

- Log warning when WotLK M2 skin file is missing (causes invisible creatures)
- Move skin loading inside version >= 264 check to skip unnecessary readFile
- Update renderShadow header signatures to match implementation (shadow culling)

include/rendering/character_renderer.hpp

@@ -63,7 +63,8 @@ public:
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const Camera& camera);
     void recreatePipelines();
     bool initializeShadow(VkRenderPass shadowRenderPass);
-    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix);
+    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix,
+                      const glm::vec3& shadowCenter = glm::vec3(0), float shadowRadius = 1e9f);
 
     void setInstancePosition(uint32_t instanceId, const glm::vec3& position);
     void setInstanceRotation(uint32_t instanceId, const glm::vec3& rotation);

include/rendering/m2_renderer.hpp

@@ -251,7 +251,8 @@ public:
     /**
      * Render depth-only pass for shadow casting
      */
-    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix, float globalTime = 0.0f);
+    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix, float globalTime = 0.0f,
+                      const glm::vec3& shadowCenter = glm::vec3(0), float shadowRadius = 1e9f);
 
     /**
      * Render M2 particle emitters (point sprites)

include/rendering/renderer.hpp

@@ -226,7 +226,7 @@ private:
     std::unique_ptr<audio::MovementSoundManager> movementSoundManager;
     std::unique_ptr<game::ZoneManager> zoneManager;
     // Shadow mapping (Vulkan)
-    static constexpr uint32_t SHADOW_MAP_SIZE = 2048;
+    static constexpr uint32_t SHADOW_MAP_SIZE = 4096;
     VkImage shadowDepthImage = VK_NULL_HANDLE;
     VmaAllocation shadowDepthAlloc = VK_NULL_HANDLE;
     VkImageView shadowDepthView = VK_NULL_HANDLE;

include/rendering/wmo_renderer.hpp

@@ -152,7 +152,8 @@ public:
     /**
      * Render depth-only for shadow casting
      */
-    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix);
+    void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix,
+                      const glm::vec3& shadowCenter = glm::vec3(0), float shadowRadius = 1e9f);
 
     /**
      * Get number of loaded models