Add Bidi ribbon monitoring for HiTi P52x printers

[mikebean233]

Summary

• Adds RibbonMonitor class that queries the HiTi P52x printer for real remaining ribbon count via the Windows Bidi interface (IBidiSpl COM), replacing the manually-decremented counter
• Falls back gracefully to the existing manual RemainingPrints tracking when the Bidi driver extension is not installed or the printer doesn't support it
• Adds a low-ribbon early warning (default: 10 prints remaining) that triggers a print error before the ribbon is completely exhausted
• Auto-fills the remaining print count in the out-of-paper error dialog by querying the printer after a ribbon swap

How it works

The RibbonMonitor uses the standard Windows BidiSpl.BidiSpl COM object to send a \Printer.Consumables.Ribbon:Remaining query to the printer driver. This requires the P52xBidiLM.dll wrapper language monitor to be installed alongside the stock HiTi driver (see the P52xL_Driver_v1.6.41.67/bidi/ directory for the driver patch).

When Bidi is unavailable (different printer, driver not patched, printer offline), all queries return null and the existing manual counter behavior is preserved — no functionality is lost.

Changes

File	Change
Printing/RibbonMonitor.cs	New — Bidi client for ribbon status queries
Printing/PrintManager.cs	Sync remaining count from printer after each print and during error checks; expose RibbonMonitor property; add low-ribbon warning
Printing/Printing.csproj	Add RibbonMonitor.cs to compilation
MainApplication/PrinterErrorDialog.xaml.cs	Accept optional RibbonMonitor param; auto-fill count after ribbon swap
MainApplication/MainWindow.xaml.cs	Pass RibbonMonitor to error dialog

Test plan

• Verify the app builds and runs with no printer connected (Bidi unavailable path)
• Verify manual RemainingPrints counter still decrements when Bidi returns null
• With patched HiTi driver installed, verify RibbonMonitor.GetRemainingPrints() returns the real count
• Verify low-ribbon warning triggers when <= 10 prints remain
• Verify the error dialog auto-populates the count after a ribbon swap
• Verify out-of-paper detection still works when ribbon is fully exhausted

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