Theme system overhaul, UI polish, and VS2022 Dark theme

- Replaced hardcoded theme factories with JSON files + CMake build step
- Shared ThemeFieldMeta table for DRY serialization and editor UI
- Fixed live preview (auto-triggers on color change, no toggle button)
- Fixed duplicate theme entries when editing built-in themes
- Moved title bar from icon to bold "Reclass" text with View > Show Icon toggle
- MDI tabs: 24px height, unicode close button styled like TypeSelectorPopup
- Added VS2022 Dark theme with purple accent colors
- Status bar padding, removed monospace font overrides on tabs/statusbar
- Default startup opens Ball demo + Unnamed hex64 tabs

CMakeLists.txt

@@ -85,6 +85,14 @@ endif()
 add_executable(ReclassMcpBridge tools/rcx-mcp-stdio.cpp)
 target_link_libraries(ReclassMcpBridge PRIVATE ${QT}::Core ${QT}::Network)
 
+# Copy built-in theme JSON files to build directory
+file(GLOB _theme_files "${CMAKE_SOURCE_DIR}/src/themes/defaults/*.json")
+file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/themes")
+foreach(_tf ${_theme_files})
+    get_filename_component(_name ${_tf} NAME)
+    configure_file(${_tf} "${CMAKE_BINARY_DIR}/themes/${_name}" COPYONLY)
+endforeach()
+
 include(deploy)
 
 add_custom_target(screenshot ALL