v2.1.1

• Enhanced iCloud sync with improved conflict detection and resolution.
• Added client identification solution for better sync coordination.
• Added sequence numbering for precise sync ordering.
• Added monthly backup preservation system.
• Added sync metadata tracking per client.
• Improved file locking mechanism for safer concurrent operations.
• Improved timestamp precision using milliseconds.
• Implemented more robust cleanup strategy for old sync files.
• Added sync nowbutton to Cloud sync setting panel.