1.5.13

Fixed

• Quotes in subpage titles (e.g. "F48") breaking page parsing
• PHP 8.2+ deprecated dynamic property warnings
• Catastrophic backtracking in regex patterns
• Page 2+ not accessible due to redirect_canonical interference
• Improperly quoted rel attribute in navigation links
• "Advaced" typo in admin submenu registration

Added

• SEO rel=prev / rel=next links in <head> for multipage posts
• Input sanitization and escaping across admin settings
• In-memory options caching to reduce database queries
• README.md with badges, requirements, and usage documentation
• CHANGELOG.md following Keep a Changelog format

Changed

• Replaced $_REQUEST with explicit $_GET / $_POST checks
• Updated minimum WordPress version to 5.0
• Tested with PHP 8.4
• Regenerated .pot translation template (73 strings)
• Default branch renamed from master to main

Removed

• Dead code, unused premium references, Italian comments
• readme.txt (replaced by README.md)

Full changelog: CHANGELOG.md