Implement complete AirPrint/IPP Everywhere printing with full IPP protocol support and custom printer management

[Copilot]

This PR implements a complete AirPrint/IPP Everywhere printing feature that provides full Internet Printing Protocol (IPP) communication, printer discovery, file selection, actual printing capabilities, and comprehensive custom printer management independent from the existing scan functionality.

Features Implemented

🖨️ Printer Discovery & Communication

• mDNS Discovery: Discovers IPP printers via _ipp._tcp and _ipps._tcp services
• IPP Protocol: Complete binary IPP message handling for printer communication
• Connection Testing: Verifies printer connectivity and status before printing
• Error Handling: Comprehensive status reporting and error management

📄 Document Processing & Printing

• File Support: Handles PDF documents and images (JPEG, PNG) via Android document picker
• Print Jobs: Sends actual print jobs using IPP Print-Job operation
• Status Tracking: Real-time feedback on print job submission and status
• Settings: Interactive copies control with validation

🔧 Custom Printer Management

• Custom Printer Dialog: User-friendly interface to add printers by IPP URL and name
• Input Validation: URL validation with error messages and placeholder examples
• Persistence: Save/load custom printers using secure local storage
• Management: Edit and delete saved custom printers with confirmation
• Integration: Seamless mixing of discovered and custom printers in unified list

📱 User Interface

• Print Tab: New navigation tab alongside Discovery and Settings
• Printer Browser: Shows discovered and saved custom printers with section dividers
• FloatingActionButton: "+" button on Print tab to add custom printers
• Printing Screen: Comprehensive interface with:
  • Printer information display
  • File selection with filename preview
  • Interactive print settings (copies with +/- controls)
  • Real-time print status with progress indicators
  • Success/error message display

🏗️ Technical Architecture

• IPP Client Library: Full IPP protocol implementation with message serialization/parsing
• Document Processor: Handles URI-based document reading and MIME type detection
• Printer Service: High-level service managing IPP operations and error handling
• Custom Printer System: Complete data models, ViewModels, and persistence layer
• Security Support: Handles both IPP and IPPS with certificate validation options

IPP Protocol Implementation

The implementation provides standards-compliant IPP communication:

// Example IPP operations supported
val printerService = PrinterService(printerUrl, timeout, debug, certValidation)

// Test printer connectivity
val connectionResult = printerService.testConnection()

// Send print job
val printResult = printerService.printDocument(
    context = context,
    documentUri = selectedFile,
    jobName = "My Document",
    copies = 2
)

Supported Operations:

• Get-Printer-Attributes - Verify printer capabilities and status
• Print-Job - Submit documents for printing with proper IPP formatting

Message Format:

• Binary IPP protocol over HTTP POST
• Proper attribute encoding (charset, natural-language, printer-uri, etc.)
• Document data handling with MIME type detection

Custom Printer Workflow

1. Navigate to "Print" tab and tap the "+" FloatingActionButton
2. Enter printer name and IPP URL (e.g., http://192.168.1.100:631/ipp/print)
3. Choose "Connect" for one-time use or "Connect and Save" for persistence
4. Custom printers appear in the printer list with edit icons and delete buttons
5. Manage saved printers independently from network discovery

User Workflow

1. Navigate to "Print" tab to discover nearby IPP/AirPrint printers or add custom ones
2. Select discovered printer or add/select custom printer URL
3. Access printing screen showing printer details and status
4. Use file picker to select PDF or image documents
5. Adjust print settings (copies using +/- buttons)
6. Submit print job with real-time status feedback
7. View success confirmation or detailed error messages

The implementation follows existing app patterns for HTTP communication, security handling, and UI consistency while providing complete IPP functionality and flexible printer management for real-world printing scenarios.

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[Chrisimx]

@copilot All IPP interaction is missing. Please implement that

[Copilot]

@copilot All IPP interaction is missing. Please implement that

I've implemented complete IPP (Internet Printing Protocol) interaction for the printing feature. The implementation includes:

IPP Protocol Support:

• Full binary IPP message handling (Get-Printer-Attributes, Print-Job)
• Printer connectivity testing and status checking
• Document processing for PDF and image files
• Proper error handling and status feedback

Enhanced UI:

• Real-time print job status with progress indicator
• Interactive copies control (+/- buttons)
• Comprehensive error messages and success notifications
• Connection testing before printing

Code Structure:

• Created ipp/ package with IPP client, message handling, and document processor
• Integrated with existing HTTP infrastructure (OkHttp) and patterns
• Follows same security and debugging patterns as scanner functionality

The printing screen now performs actual IPP communication with discovered printers instead of just showing TODO comments. Users can select documents, adjust settings, and send real print jobs with status feedback.

Commit: fe8c159

[Chrisimx]

@copilot Now add custom printer support

[Copilot]

@copilot Now add custom printer support

I've implemented complete custom printer support following the same patterns as the existing scanner functionality.

Features Added:

• CustomPrinterDialog - Input dialog for printer name and IPP URL with validation
• FloatingActionButton - "+" button on the Print tab to add custom printers
• Printer List Integration - Custom printers shown alongside discovered printers with delete functionality
• Data Persistence - Custom printers saved/loaded using existing store infrastructure

User Workflow:

1. Navigate to Print tab → tap "+" button → enter printer details → connect/save
2. Custom printers appear in list with edit icon and delete button
3. Can connect without saving or save for future use
4. Seamless navigation to printing screen with custom printer URLs

The implementation leverages the existing CustomPrinter data model, ViewModel, and store while providing the same UX patterns as the scanner functionality.

Commit: ca2939e