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* Update outdated readme info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

frontend/src/components/window/MainWindow.svelte

@@ -1,10 +1,10 @@
 <script lang="ts">
 	import { getContext } from "svelte";
 
+	import { isPlatformNative } from "@graphite/../wasm/pkg/graphite_wasm";
 	import type { AppWindowState } from "@graphite/state-providers/app-window";
 	import type { DialogState } from "@graphite/state-providers/dialog";
 	import type { TooltipState } from "@graphite/state-providers/tooltip";
-	import { isDesktop } from "@graphite/utility-functions/platform";
 
 	import Dialog from "@graphite/components/floating-menus/Dialog.svelte";
 	import Tooltip from "@graphite/components/floating-menus/Tooltip.svelte";
@@ -31,7 +31,7 @@
 	{#if $tooltip.visible}
 		<Tooltip />
 	{/if}
-	{#if isDesktop() && new Date() > new Date("2026-03-15")}
+	{#if isPlatformNative() && new Date() > new Date("2026-03-15")}
 		<LayoutCol class="release-candidate-expiry">
 			<TextLabel>
 				<p>