Refactor messages.ts by removing class-transformer and JS classes (#3858)

* Fix gamma correction with HTML-based editable Text tool text

* Migrate simple, undecorated classes to types

* Remove TupleToVec2 transformation

* Remove @Transform from tooltips

* Cleanup: replace value.toString() with String(value) everywhere

* Convert documentId from string to bigint

* Migrate the rest of the easy @Transform/@Type decorations

* Migrate FillChoice

* Migrate WidgetDiffUpdate

* Migrate WidgetInstance

* Migrate away from classes that extend WidgetProps

* Remove class-transformer and all classes in messages.ts

* Migrate UI layout passing

* Remove dead code

* Remove unnecessary export and readonly prefixes

* Remove HSVA type

* Break out Color, Gradient, and FillChoice functions into a utility-functions file

* Move widget helper functions from messages.ts into a new utility-functions file; restructure type imports

* Reduce internal type defs

* Rename JsMessage to FrontendMessage

* Code review fixes

* Fix other usages

* Tidying up

desktop/wrapper/src/intercept_frontend_message.rs

@@ -1,6 +1,7 @@
-use std::path::PathBuf;
-
+#[cfg(target_os = "macos")]
+use graphite_editor::messages::layout::utility_types::layout_widget::LayoutTarget;
 use graphite_editor::messages::prelude::FrontendMessage;
+use std::path::PathBuf;
 
 use super::DesktopWrapperMessageDispatcher;
 use super::messages::{DesktopFrontendMessage, Document, FileFilter, OpenFileDialogContext, SaveFileDialogContext};
@@ -103,7 +104,10 @@ pub(super) fn intercept_frontend_message(dispatcher: &mut DesktopWrapperMessageD
 			dispatcher.respond(DesktopFrontendMessage::PersistenceLoadPreferences);
 		}
 		#[cfg(target_os = "macos")]
-		FrontendMessage::UpdateMenuBarLayout { diff } => {
+		FrontendMessage::UpdateLayout {
+			layout_target: LayoutTarget::MenuBar,
+			diff,
+		} => {
 			use graphite_editor::messages::tool::tool_messages::tool_prelude::{DiffUpdate, WidgetDiff};
 			match diff.as_slice() {
 				[