Add support for Roman numeral page parsing

[sambhavthakkar]

Fixes #164

Changes

• Added support for parsing Roman numeral page numbers (e.g., i, ii, iv)
• Handles real-world formats with trailing punctuation (e.g., "vii.", "(iv)")
• Preserves existing integer parsing behavior

Examples

• "iv" → 4
• "vii." → 7
• "10" → 10

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[sambhavthakkar]

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