Printer Manager v2: WPF, Fluent UI and printer diagnostics

[lukethehawk]

Summary

This pull request modernizes Printer Manager while preserving its original goal: a fast, portable Windows printer toolbox.

Major changes

• Migrates the UI from WinForms to WPF on .NET 10
• Uses the native WPF Fluent theme with automatic Windows light/dark mode
• Adds a resizable two-pane interface with live printer search
• Shows status, queued jobs, port, driver and default-printer state
• Adds quick actions for:
  • print queue
  • preferences
  • properties
  • default printer
  • Windows test page
  • printer Web UI when a TCP/IP host is detected
• Adds network diagnostics:
  • ICMP ping
  • RAW port 9100 connectivity
• Adds a copyable diagnostic report for support work
• Replaces the previous WMI/USB offline heuristic with native spooler data
• Refactors printer, network and spooler functionality into separate services
• Makes spooler cleanup safe by stopping the service before deleting queue files
• Keeps smart UAC elevation only for privileged spooler operations
• Removes obsolete v1 files and screenshot
• Adds GitHub Actions CI and portable win-x64 publishing

Verification

GitHub Actions run #3 completed successfully on Windows Server 2025 / Visual Studio 2026 runner:

• Restore: passed
• Build: passed
• Single-file self-contained publish: passed
• Portable artifact upload: passed

The application still needs normal hands-on testing against real local, USB, WSD and TCP/IP printers before merging.