Layout Builder Mutations

Layout Builder routes state changes through mutation Actions under packages/layout-builder/src/Actions/Mutations in the capell-app/layout-builder package.

Each mutation accepts LayoutBuilderStateData 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 NormalizeLayoutBuilderStateAction before returning.