build: convert project from DeskBand DLL to standalone EXE (stub WinMain)
- Delete COM/DeskBand sources, .def, .rgs, .idl, Guids.h, MFC AboutDialog
- Rewrite vcxproj as Application (v143, SDK 26100, C++17, no MIDL)
- Remove REGISTRY .rgs reference from .rc
- Add stub App.cpp with wWinMain
- CalculatorWindow.cpp excluded from build until Task 10 rework
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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