Added new reports "Head Days" and "Position Statement", and added new "Joining Plan" feature.

• Added new "Head Days" report.
  
• Added new "Position Statement" report.
  
• Added "Joining Plan" feature.
  
• Added default value and presets for Joining Male in session setup.
  
• Fixed a UI issue with the "Joined" toggle button on the scan form.
  
• Resolved intermittent loading error of the property list on the dashboard.