Implement comprehensive print functionality for KGC gold testing application

[Copilot]

This PR implements a complete WPF application for Krupa Gold Company (KGC) with comprehensive print functionality for generating professional test reports. The application provides a modern, golden-themed interface for jewelry testing laboratories.

Key Features Implemented

Main Testing Interface

• Professional UI: Golden-themed interface with company branding and logo area
• Complete Data Entry: All required controls including party name dropdown (cmbPartyName), item name dropdown (cmbItemName), main purity result (txtMain_1), weight/amount fields (txtMain_2, txtMain_3), and 12 detailed metric fields (txtMetric1-txtMetric12)
• Program Types: Radio button selection for Krupa Gold, Fine Gold, Silver Ornament, and Other Metal testing programs
• Data Validation: Comprehensive validation ensuring required fields are completed before printing

Professional Print System

• Print Window: Dedicated PrintWindow.xaml with A4-optimized layout for professional test reports
• Print Preview: Full preview functionality allowing users to review reports before printing
• Professional Layout:
  • Company header with logo area and complete business information
  • Structured test information section with all party and item details
  • Highlighted main results display (purity, weight, amount)
  • Organized detailed measurements table
  • Professional footer with signature areas for technician and lab director authentication

Technical Implementation

• Data Model: TestData class for structured data transfer between main window and print window
• Print Integration: Native WPF PrintDialog integration with A4 paper size optimization
• Error Handling: Comprehensive error handling for print operations with user-friendly feedback
• Professional Styling: Consistent golden theme throughout with proper typography and spacing

Code Structure

KGC/
├── App.xaml                   # Application resources and golden theme styles
├── MainWindow.xaml            # Main testing interface with all required controls
├── MainWindow.xaml.cs         # Business logic, validation, and print integration
├── PrintWindow.xaml           # Professional A4 print report layout
├── PrintWindow.xaml.cs        # Print functionality and data formatting
└── Documentation.md           # Comprehensive usage documentation

The implementation provides a production-ready solution for jewelry testing laboratories, meeting all specified requirements for professional test report generation with comprehensive print functionality.

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