[improve]: Loop Experience Redesign

### Improvement target

Current loop visual experience does not emphasize the loop scope. Loops are visualized similar to other flow control components like parallel branch or conditional.
Flows with multiple flow control components are clumsy to effectivly comprehend and understand it.
Here is example of flow with two loops where one is nested:

### Improvement description

See how loops are visualised in MIT Scratch language:
https://eduseed.in/exploring-conditionals-and-loops-in-scratch/
Here is screenshot:
https://i0.wp.com/eduseed.in/wp-content/uploads/2024/10/Condition-and-loop.png?w=600&ssl=1

Here is photos of our brainstorming:
Loops without EMPTY LINE

Loops as DIVs:

### Observed Version

0.24.3