WinDbg plugin, ProcessMemoryWindows, dialog cleanup, and misc fixes

- Add WinDbgMemory plugin with debug server connection support
- Replace ProcessMemory plugin with Windows-specific ProcessMemoryWindows
- Simplify WinDbg dialog: single panel, no tabs, palette-based theming
- Fix example text visibility on dark themes (QPalette::Dark -> Disabled WindowText)
- Fix "file" -> "File" capitalization in source menu
- Add windbg_provider and com_security tests

CMakeLists.txt

@@ -257,6 +257,24 @@ if(BUILD_TESTING)
     target_link_libraries(test_theme PRIVATE ${QT}::Widgets ${QT}::Test)
     add_test(NAME test_theme COMMAND test_theme)
 
+    add_executable(test_windbg_provider tests/test_windbg_provider.cpp
+        plugins/WinDbgMemory/WinDbgMemoryPlugin.cpp)
+    target_include_directories(test_windbg_provider PRIVATE src plugins/WinDbgMemory)
+    target_link_libraries(test_windbg_provider PRIVATE
+        ${QT}::Widgets ${QT}::Concurrent ${QT}::Test)
+    if(WIN32)
+        target_link_libraries(test_windbg_provider PRIVATE dbgeng ole32)
+    endif()
+    add_test(NAME test_windbg_provider COMMAND test_windbg_provider)
+
+    # Standalone test: proves whether CoInitializeSecurity is needed for DebugConnect
+    # Requires a running WinDbg debug server on port 5055
+    if(WIN32)
+        add_executable(test_com_security tests/test_com_security.cpp)
+        target_link_libraries(test_com_security PRIVATE dbgeng ole32 version)
+        add_test(NAME test_com_security COMMAND test_com_security)
+    endif()
+
     # Deploy Qt runtime DLLs for tests (run windeployqt on a representative test exe
     # that links the broadest set of Qt modules; all test exes share the same output dir)
     if(TARGET ${QT}::windeployqt)
@@ -270,4 +288,5 @@ if(BUILD_TESTING)
         )
     endif()
 endif()
-add_subdirectory(plugins/ProcessMemory)
+add_subdirectory(plugins/ProcessMemoryWindows)
+add_subdirectory(plugins/WinDbgMemory)