Refactor platform detection to use import.meta.env.MODE instead of isPlatformNative()

frontend/src/components/panels/Welcome.svelte

@@ -8,7 +8,6 @@
 	import type { SubscriptionsRouter } from "/src/subscriptions-router";
 	import { pasteFile } from "/src/utility-functions/files";
 	import { patchLayout } from "/src/utility-functions/widgets";
-	import { isPlatformNative } from "/wrapper/pkg/graphite_wasm_wrapper";
 	import type { EditorWrapper, Layout } from "/wrapper/pkg/graphite_wasm_wrapper";
 
 	const subscriptions = getContext<SubscriptionsRouter>("subscriptions");
@@ -50,7 +49,7 @@
 	</LayoutCol>
 	<LayoutCol class="bottom-message">
 		<TextLabel italic={true} disabled={true}>
-			{#if isPlatformNative()}
+			{#if import.meta.env.MODE === "native"}
 				You are testing Release Candidate 4 of the 1.0 desktop release. Please regularly check Discord for the next testing build and report issues you encounter.
 			{/if}
 		</TextLabel>