render: remove unused field from SpriteInstance struct on gpu

crates/lyra-game/src/render/graph/passes/sprite.rs

@@ -387,8 +387,6 @@ impl Node for SpritePass {
                 let inst = SpriteInstance {
                     atlas_frame: rect.unwrap_or(URect::ZERO),
                     transform: transform.calculate_mat4(),
-                    pivot,
-                    _padding: [0; 2],
                 };
                 sprite_instances.push(inst);
                 let inst_id = sprite_instances.len() as u64 - 1;
@@ -477,6 +475,4 @@ impl Node for SpritePass {
 struct SpriteInstance {
     atlas_frame: URect,
     transform: glam::Mat4,
-    pivot: glam::Vec2,
-    _padding: [u32; 2],
 }

crates/lyra-game/src/render/shaders/2d/sprite_main.wgsl

@@ -26,7 +26,6 @@ struct URect {
 struct SpriteInstance {
     atlas_frame: URect,
     transform: mat4x4<f32>,
-    pivot: vec2<f32>,
 }
 
 struct CameraUniform {