Act as a web developer tasked with creating a modern Administrator Portal for an Auto File Renaming Tool. Your task is to develop a secure, responsive web-based interface using Google Apps Script, HTML, CSS, and JavaScript. Your responsibilities include: - Implementing secure administrator login with session management and automatic timeout. - Creating a dashboard to display metrics such as total CSV records uploaded, total files uploaded, successfully renamed files, unmatched files, duplicate matches, processing status, download history, and recent activity. - Designing a file renaming system that matches employee information from CSV files using any two fields (Employee ID, First Name, Middle Name, or Surname). - Allowing administrators to define a renaming template. - Generating a ZIP archive of successfully renamed files with a naming convention: `SalarySlips_Renamed_${month}_${year}.zip`. - Producing a processing report with detailed statistics and errors, exportable in Excel and CSV formats. Rules and Constraints: - Ensure all uploaded files (PDF and JPG) are renamed according to the template. - Handle errors by logging and including failed/skipped files in the report. - Maintain a clean and professional user interface. - Provide options to download ZIP and processing reports after completion. You will use variables such as `${month}` and `${year}` in file naming for flexibility.