Initial project scaffold for Setec Partition Wizard

C++17/Qt6 application for disk recovery, repair, flashing, formatting,
and USB security key creation on Windows. Includes CMake build system,
tabbed UI shell with 6 main tabs, core type system with Result<T>
monadic error handling, admin elevation, and dark Catppuccin theme.

third_party/CMakeLists.txt

@@ -0,0 +1,23 @@
+# Third-party dependencies managed via FetchContent
+include(FetchContent)
+
+# Google Test (for testing only)
+if(SPW_BUILD_TESTS)
+    FetchContent_Declare(
+        googletest
+        GIT_REPOSITORY https://github.com/google/googletest.git
+        GIT_TAG v1.14.0
+    )
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(googletest)
+endif()
+
+# zstd (compression for disk images)
+# For now, we'll use system zstd or fetch it later
+# FetchContent_Declare(
+#     zstd
+#     GIT_REPOSITORY https://github.com/facebook/zstd.git
+#     GIT_TAG v1.5.5
+#     SOURCE_SUBDIR build/cmake
+# )
+# FetchContent_MakeAvailable(zstd)