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20d383d4ab
Add a new "Add by Address" flow in the printer settings that allows users to manually add printers by IP address or hostname, enabling printing to devices not visible via mDNS/Avahi discovery (e.g., printers behind Tailscale subnet routers, VPNs, or across network boundaries). Go backend: - New cups.testConnection IPC method that probes remote printers via IPP Get-Printer-Attributes with /ipp/print then / fallback - Input validation with host sanitization and protocol allowlist - Auth-aware probing (HTTP 401/403 reported as reachable) - lpadmin CLI fallback for CreatePrinter/DeletePrinter when cups-pk-helper polkit authorization fails QML frontend: - "Add by Address" toggle alongside existing device discovery - Manual entry form with host, port, protocol fields - Test Connection button with loading state and result display - Smart PPD auto-selection by probed makeModel with driverless fallback - All strings use I18n.tr() with translator context Includes 20+ unit tests covering validation, probe delegation, TLS flag propagation, auth error detection, and handler routing.