* Fix utility file typings; the pervasive use of `any` severely degrades the benefits of leveraging modern TypeScript features. * The core calculator logic utilizes a highly testable, pure function state-reducer pattern, effectively separating computation from React state. * Implement safeguards within `handleEqual` to mitigate common floating-point precision errors during JavaScript arithmetic operations. * Address the structural inconsistency by correcting the repeated "CalulatorScreen" typo in component and file names immediately. * Consolidate dimension imports; avoid redundant `Dimensions.get("window")` calls across various component definition files like `Header.tsx`.
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