Refactor daysInMonth to use lookup table for static values

[mjradwin]

Summary

Refactored the daysInMonth function to improve readability and performance by using a lookup table for months with static day counts, while maintaining the same logic for variable-length months.

Key Changes

• Introduced STATIC_DAYS_IN_MONTH constant array that maps each Hebrew month to its day count (0 indicates variable length)
• Simplified daysInMonth logic by first checking the lookup table for static values
• Replaced the switch statement and complex conditional logic with a more concise implementation
• Preserved all existing behavior for variable-length months (CHESHVAN, KISLEV, ADAR_I)

Implementation Details

• The lookup table uses 0 as a sentinel value to indicate months whose length depends on the year properties
• For static months, the function returns immediately from the lookup table
• For variable months, the function applies the appropriate year-dependent logic (leap year check, long Cheshvan check, short Kislev check)
• This approach reduces code duplication and makes the month length rules more explicit and maintainable

https://claude.ai/code/session_01VTWaREoLypCvHzEkkTWzWm