move compiler options to svelte.config.js, to remove red squigglies in editor

Author: Rich-Harris

playgrounds/sandbox/svelte.config.js

@@ -0,0 +1,9 @@
+export default {
+	compilerOptions: {
+		hmr: false,
+
+		experimental: {
+			async: true
+		}
+	}
+};

playgrounds/sandbox/vite.config.js

@@ -7,17 +7,7 @@ export default defineConfig({
 		minify: false
 	},
 
-	plugins: [
-		inspect(),
-		svelte({
-			compilerOptions: {
-				hmr: false,
-				experimental: {
-					async: true
-				}
-			}
-		})
-	],
+	plugins: [inspect(), svelte()],
 
 	optimizeDeps: {
 		// svelte is a local workspace package, optimizing it would require dev server restarts with --force for every change