Move multiple GUI nodes at once in the hierarchy

**Is your feature request related to a problem? Please describe (REQUIRED):**
Currently, it’s only possible to move one GUI node at a time in the hierarchy using Alt + Up/Down.
When working with complex GUI trees that contain many child nodes, this becomes very inconvenient.
For example, if a node has 20 children and I add 4 more that need to be moved above them, I have to move each one individually - that’s 80 key presses instead of selecting and moving them together.

**Describe the solution you'd like (REQUIRED):**
Allow moving multiple selected GUI nodes at once using Alt + Up/Down in the hierarchy view.
All selected nodes should move together, preserving their relative order.

**Describe alternatives you've considered (REQUIRED):**
Currently, the only option is to move each node one by one using Alt + Up/Down, which is very time-consuming in large hierarchies.

**Additional context (OPTIONAL):**
This feature would greatly improve workflow when organizing complex GUI structures with many grouped or repeated elements.