Content Sections Mutations
Content Sections routes state changes through mutation Actions under packages/content-sections/src/Actions/Mutations.
Each mutation accepts ContentSectionsStateData and returns LayoutMutationResultData. The result contains normalized state, diagnostics, and change summary entries.
The Livewire component should not manually reorder containers, assets, originalAssets, or selectedRecords when a mutation Action exists. Add new behavior by creating a mutation Action, testing it directly, then wiring the Livewire method to that Action.
Every mutation must call NormalizeContentSectionsStateAction before returning.