feat: Implement HTML Button Tag Support for PDF Generation

[Deepesh8122]

Description

Added support for HTML button elements in PDF generation with full styling capabilities and proper attribute handling.

Key Features

• ✨ Complete button tag implementation with default styling
• 🎨 Support for custom CSS properties and classes
• ✅ Comprehensive test coverage
• 🔍 Proper style inheritance and reset handling

Technical Details

• Implemented Button class extending AbstractTag
• Added default button styling (background, border, padding)
• Handles common button attributes (type, class, id)
• Includes style management system
• Added unit tests covering core functionality

Test Coverage

ButtonTest Results:
✓ Button name validation
✓ Button properties handling
✓ Style inheritance
✓ Custom class support

[spipu]

it is not working, i revert all