Eliminates all 4%-rule related overlays, buttons, and UI elements from the calculator for a simpler experience. Introduces hydration of calculator inputs from URL search params, enabling sharing of form state via URLs and restoring state on page reload. Updates the form's share button styling and ensures all necessary URL parameters are set for sharing.
Also refactors tests to remove 4%-rule tests and adds mocks for next/navigation.
Simplifies calculator behavior and improves accessibility for stateful URLs.
Felix Schulze
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