fix(rendering): complete character visual regression fixes

extension/src/metin2_model.h

@@ -7,6 +7,7 @@
 #include <godot_cpp/classes/ref.hpp>
 #include <godot_cpp/templates/hash_map.hpp>
 #include <godot_cpp/variant/array.hpp>
+#include <godot_cpp/variant/aabb.hpp>
 #include <godot_cpp/variant/packed_string_array.hpp>
 #include <godot_cpp/variant/string.hpp>
 
@@ -126,6 +127,9 @@ public:
 
 	// One-line summary (bones / meshes / verts / bounds).
 	godot::String get_info() const;
+	// Deformed mesh bounds in this node's local GR2 coordinate frame.  Unlike
+	// MeshInstance3D::get_aabb(), this follows the GPU shader pose as well.
+	godot::AABB get_visual_aabb();
 	// Parent-space Y adjustment that places the bind-pose model's lowest point
 	// on the actor origin. GR2 is Z-up/cm; this is converted to Godot Y/metres.
 	double get_ground_offset() const { return ground_offset; }
@@ -237,12 +241,16 @@ private:
 	std::vector<godot::Ref<godot::Material>> surf_mats; // resolved once; re-assigned each cpu_skin frame
 	godot::Ref<godot::ArrayMesh> cpu_mesh;   // rebuilt each frame in cpu_skin mode
 	bool gpu_skin_active = false;
+	bool gpu_visual_bounds_ready = false;
+	bool have_visual_bounds = false;
+	godot::AABB visual_bounds;
 	std::vector<gr2::Mat4> current_skin;
 	godot::Ref<godot::Image> bones_img;      // RGBAF 3 x bone_count
 	godot::Ref<godot::ImageTexture> bones_tex;
 
 	void _clear_children();
 	void _apply_materials();
+	bool _update_skinned_bounds(const std::vector<gr2::Mat4> &skin);
 	godot::String _guess_texture_dir() const;
 	// Resolve a "d:/ymir work/..." path referenced from `base` (.msm/.msa) to an
 	// absolute file. Passes existing absolute paths through.