design-editor-architecture

Where design editor behavior lives and how the editor component is split across `DesignEditor.tsx`, the `use-editor-*` hooks, and the view render functions. Use before changing any editor behavior — undo/redo, paste, delete, duplicate, style commit, layer move/rename, export, structure change — or before editing `app/pages/DesignEditor.tsx` or a `use-editor…

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