Change shared files naming. Rework tree structure and item management rendering.

shared/reactive.ts

@@ -273,7 +273,12 @@ export function reactive<T extends object>(obj: T | Proxy<T>): T | Proxy<T>
             const result = Reflect.ownKeys(target);
             track(target, SYMBOLS.ITERATE);
             return result;
-        }
+        },
+        defineProperty: (target, property, attributes) => {
+            const result = Reflect.defineProperty(target, property, attributes);
+            trigger(target, SYMBOLS.ITERATE);
+            return result;
+        },
     }) as Proxy<T>;
 
     _reactiveCache.set(obj, proxy);