Implement hitbox viewer (#81)

Reviewed-on: #81
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/baked_animation/visual_binding.rs

@@ -92,9 +92,12 @@ pub(super) fn bind_fighter_visual_bones(
 pub(super) fn apply_baked_fighter_visual_pose(
     mut nodes: Query<(&mut Transform, &BakedFighterBone)>,
     fighters: Query<&FighterBoneMatrices>,
-    timing: Res<GgrsFrameTiming>,
+    timing: Option<Res<GgrsFrameTiming>>,
 ) {
-    let overstep_fraction = timing.overstep_fraction();
+    let overstep_fraction = timing
+        .as_deref()
+        .map(GgrsFrameTiming::overstep_fraction)
+        .unwrap_or(0.0);
     for (mut transform, bone) in &mut nodes {
         let Ok(matrices) = fighters.get(bone.fighter) else {
             continue;