Add full implementation: core engine, UI, build fixes, and compilation

- Implement all core modules: disk I/O, partition tables, filesystem
  formatting, recovery, imaging, diagnostics, security, and maintenance
- Implement all UI tabs with full widget layouts and backend integration
- Fix MSVC compilation: NOMINMAX, WIN32_LEAN_AND_MEAN, missing includes
  (winioctl.h, bcrypt.h, shellapi.h, cwctype), type mismatches, and
  POSIX macro conflicts
- Add Guid implementation (Types.cpp), move DiskAccessMode to Types.h
- Add CMake presets with embedded MSVC/SDK environment for Git Bash builds
- Add build scripts, key generation, icon resources, and windeployqt
- Include pre-built hwdiag library and third-party integration

third_party/hwdiag/CMakeLists.txt

@@ -0,0 +1,68 @@
+# libspw_hwdiag — Hardware Diagnostics Support Library
+#
+# This CMakeLists is used in TWO modes:
+#
+# 1. LIBRARY BUILD MODE (standalone — run by developer to produce .lib):
+#    cd third_party/hwdiag && cmake -B build && cmake --build build
+#    Produces lib/spw_hwdiag.lib which is committed to the repo.
+#
+# 2. CONSUMER MODE (from main project):
+#    The main project just links against the pre-built .lib in lib/.
+#    This CMakeLists is NOT add_subdirectory'd by the main project.
+
+cmake_minimum_required(VERSION 3.25)
+project(spw_hwdiag VERSION 1.0.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_AUTOMOC ON)
+
+find_package(Qt6 REQUIRED COMPONENTS Widgets Core)
+
+# Internal sources (the secret implementations)
+set(INTERNAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/internal")
+
+set(HWDIAG_SOURCES
+    hwdiag_impl.cpp
+    ${INTERNAL_DIR}/AstroChicken.cpp
+    ${INTERNAL_DIR}/Vohaul.cpp
+    ${INTERNAL_DIR}/Arnoid.cpp
+    ${INTERNAL_DIR}/StarGenerator.cpp
+    ${INTERNAL_DIR}/OratDecoder.cpp
+    # Common dependencies needed by internal code
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../src/core/common/Logging.cpp
+)
+
+set(HWDIAG_HEADERS
+    include/hwdiag.h
+    ${INTERNAL_DIR}/AstroChicken.h
+    ${INTERNAL_DIR}/Vohaul.h
+    ${INTERNAL_DIR}/Arnoid.h
+    ${INTERNAL_DIR}/StarGenerator.h
+    ${INTERNAL_DIR}/OratDecoder.h
+)
+
+add_library(spw_hwdiag STATIC ${HWDIAG_SOURCES} ${HWDIAG_HEADERS})
+
+target_include_directories(spw_hwdiag PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../src
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../build/default/generated  # EmbeddedKey.h
+)
+
+target_link_libraries(spw_hwdiag PRIVATE
+    Qt6::Widgets
+    Qt6::Core
+)
+
+if(WIN32)
+    target_link_libraries(spw_hwdiag PRIVATE setupapi wbemuuid ole32 oleaut32)
+endif()
+
+# Copy the built library to lib/ for distribution
+add_custom_command(TARGET spw_hwdiag POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy
+        "$<TARGET_FILE:spw_hwdiag>"
+        "${CMAKE_CURRENT_SOURCE_DIR}/lib/$<TARGET_FILE_NAME:spw_hwdiag>"
+    COMMENT "Copying library to lib/ for distribution..."
+)