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Refactored App.tsx by extracting the ModalController component into its own file (components/ModalController.tsx), moving File System Access API global type declarations to a dedicated global.d.ts file, and moving the saveFileToDisk utility function to utils/fileHelpers.ts. The ModalConfig type was centralized in types.ts. Also added a helper for modal error messages in App.tsx for cleaner code and removed the empty components/null file.