Date To Today Calculator - Logic Refresh and Layout Alignment

The Date To Today calculator has been updated with more robust date-difference logic and a compact two-column portal-style layout aligned with the Date Difference service. Date calculations now use stable date-only math for better correctness across edge cases, including month-end transitions and leap-year boundaries. The interface was redesigned to improve scanability: settings are grouped in the first column, while results are shown in the second with a clear structure for precise duration and totals by unit. Unit filters and result cards were also aligned to be nearly identical to the Date Difference experience, including days, business days, weeks, months, years, and total hours in the all-units view.