fix(clock): prevent DestroyNodeHierarchyRecursive from destroying sibling digit frames

[CanerKaraca23]

Summary

Fixes an issue where FrameUtil::DestroyNodeHierarchyRecursive destroyed sibling RwFrame nodes in addition to its children by traversing frame->next.

Details

• Previously, DestroyNodeHierarchyRecursive read frame->next and recursively destroyed it. When called on a child node (such as digit sub-frames during digital clock initialization), this recursively destroyed all following sibling frames belonging to the parent node.
• Iterates only over the frame's children (frame->child and each child's siblings) to cleanly tear down the descendant hierarchy without touching the target node's siblings.
• Added null-check for atomic->clump prior to RpClumpRemoveAtomic.