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

editor/src/dispatcher.rs

@@ -590,7 +590,11 @@ mod test {
 
 			for response in responses {
 				// Check for the existence of the file format incompatibility warning dialog after opening the test file
-				if let FrontendMessage::UpdateDialogColumn1 { diff } = response {
+				if let FrontendMessage::UpdateLayout {
+					layout_target: LayoutTarget::DialogColumn1,
+					diff,
+				} = response
+				{
 					if let DiffUpdate::Layout(sub_layout) = &diff[0].new_value {
 						if let LayoutGroup::Row { widgets } = &sub_layout.0[0] {
 							if let Widget::TextLabel(TextLabel { value, .. }) = &*widgets[0].widget {