Refactor the TypeScript data flow for full type safety and auto-generation of Rust types (#3865)

* Migrate Specta to Tsify to auto-generate messages.ts, working except colors and widgets

* Adopt the generated FillColor/Color/GradientStops

* Fix widget typing

* Separate WidgetGroup enum variants into wrapper structs

* Small rename

* Simplify widgets further

* Clean up message type references

* Switch type imports to the auto-generated file

* Remove lowercase serde rename

* Fix FillChoice deserialization

* Fix small regression from #3837

* Improve type safety

* Make WidgetSpan type-safe

* More cleanup and type safety

* More type safety

* More type safety

* Get the rest to type-check without errors; improve widget builder macro to have optional icons; improve Svelte 5 configs

* Cargo fmt

* Fix imports

* Update outdated readme info

* Fix lint command rename references

* Fix typos

* One more typos fix

* Remove unnecessary dep: prefix from the edited Cargo.toml files

* Remove excess parts from Cargo.toml

* Fix compiling on desktop

* Revert "Remove excess parts from Cargo.toml"

This reverts commit 6b711117b3a5d5d8a3ee20f36a43bc74930b7c82.

* Update dev docs with simpler, more accurate instructions

editor/src/node_graph_executor/runtime.rs

@@ -56,7 +56,7 @@ pub struct NodeRuntime {
 	thumbnail_renders: HashMap<NodeId, Vec<SvgSegment>>,
 	vector_modify: HashMap<NodeId, Vector>,
 
-	/// Cached surface for WASM viewport rendering (reused across frames)
+	/// Cached surface for Wasm viewport rendering (reused across frames)
 	#[cfg(all(target_family = "wasm", feature = "gpu"))]
 	wasm_viewport_surface: Option<wgpu_executor::WgpuSurface>,
 }
@@ -309,7 +309,7 @@ impl NodeRuntime {
 							data: RenderOutputType::Texture(image_texture),
 							metadata,
 						})) if !render_config.for_export => {
-							// On WASM, for viewport rendering, blit the texture to a surface and return a CanvasFrame
+							// On Wasm, for viewport rendering, blit the texture to a surface and return a CanvasFrame
 							let app_io = self.editor_api.application_io.as_ref().unwrap();
 							let executor = app_io.gpu_executor().expect("GPU executor should be available when we receive a texture");