Fix Token_lib::render() for PHP 8.4 compatibility

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- Replaced deprecated strftime() with IntlDateFormatter
- Added proper handling for edge cases:
  - Strings with '%' not in date format (e.g., 'Discount: 50%')
  - Invalid date formats (e.g., '%-%-%', '%Y-%q-%bad')
  - Very long strings
- Added comprehensive unit tests for Token_lib
- All date format specifiers now mapped to IntlDateFormatter patterns

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