cmake+Utilities: Ensure WebContent and resources are included in bundle

For the build directory only, copy WebContent next to ladybird and add
a symlink to the source dir into Content/Resources/ of ladybird.app.

This allows building and running ladybird in Xcode and Instruments,
as long as the SERENITY_SOURCE_DIR is set in the ladybird scheme.

CMakeLists.txt

@@ -97,6 +97,14 @@ qt_finalize_executable(ladybird)
 add_subdirectory(WebContent)
 add_dependencies(ladybird WebContent)
 
+if (APPLE)
+    set(app_dir "$<TARGET_FILE_DIR:ladybird>")
+    set(bundle_dir "$<TARGET_BUNDLE_DIR:ladybird>")
+    add_custom_command(TARGET ladybird POST_BUILD
+        COMMAND "${CMAKE_COMMAND}" -E copy_if_different "$<TARGET_FILE:WebContent>" "${app_dir}"
+    )
+endif()
+
 if(NOT CMAKE_SKIP_INSTALL_RULES)
     include(cmake/InstallRules.cmake)
 endif()

Utilities.cpp

@@ -41,7 +41,11 @@ void platform_init()
         if (Core::File::is_directory(home_lagom))
             return home_lagom;
         auto app_dir = akstring_from_qstring(QCoreApplication::applicationDirPath());
+#    ifdef AK_OS_MACOS
+        return LexicalPath(app_dir).parent().append("Resources"sv).string();
+#    else
         return LexicalPath(app_dir).parent().append("share"sv).string();
+#    endif
     }();
 #endif
 }