Entity Hierarchy & Scripting Integration

finally caved & added actual parent/child relationships to entities

changes

entity hierarchy

• entities can now have a parent & children via a new RelationshipComponent. Registry::Reparent() handles moving an entity under a new parent, with cycle & self-parenting protection so you cant do anything silly like parenting an entity to its own descendant.
• TransformComponent now has a worldTransform alongside the existing local one, a new HierarchySystem
• systems that care about actual position (i.e AISystem) read worldTransform now instead of assuming local == world.
• destroying an entity recursively destroys its children too & unlinks it from its parent’s child list
• scene serialization now saves & restores the hierarchy

editor

• the Registry panel is a proper collapsible tree now instead of a flat list
• drag & drop reparenting, plus a right click menu for “Create Child”, “Detach”, & “Set Parent”.

scripting

• pulled all the entity/component script bindings out into their own EngineLibRegistry.cpp module, they were kind of scattered around before & this makes them way easier to find & extend.
• scripts can now walk the hierarchy too (get children, etc), same module.
• added SetFont/GetFont bindings so scripts can assign or query a button’s font, small thing but script generated buttons wont have visible text without it :)

misc cleanup

• small modernization stuff while i was in these files anyway: dropped redundant ternary parens, swapped a bunch of auto x = ...; if (x) into if-with-initializer, dropped some unnecessary global qualifiers, const-correctness fixes on UISystem::Update & UIRenderer::Flush.

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(yes i know the gizmos are offset and buggy, i kind of forgot to update the gizmo code after changing transforms :p )