Fix/object-hierarchy

[AlexZ005]

This pull request includes significant changes to the Objects.svelte component to improve the handling of group elements and their child elements. The changes simplify the code and ensure proper display of icons and interaction elements based on the type and state of the elements.

Improvements to group element handling:

• Simplified the conditional rendering logic for group elements by removing redundant if statements and merging conditions. This ensures that the appropriate icons and interaction elements are displayed based on whether the group is expanded or collapsed. [1] [2]

Enhancements to icon display:

• Added specific icons for different types of elements (Group, Light, and Object) for collapsible elements. This change helps users quickly identify the type of each element in the list.

Code simplification:

• Removed redundant code blocks that handled the display of elements when they were not part of a group. This reduces the overall complexity of the component and makes it easier to maintain.