feat: Level loading from TOML asset

- Fixed detect_interactions system
- Added test for deserializing asset with plugin

src/layout/asset/structs/inner.rs

@@ -171,7 +171,7 @@ impl From<ContainerDataInner> for ContainerData {
         Self {
             pos: pos.into(),
             size: size.unwrap_or_default().into(),
-            items,
+            items: items.unwrap_or_default(),
         }
     }
 }