fix: render merged CSS when cssCodeSplit is false

Refs: #1324

Author: katywings

packages/start/src/server/handler.ts

@@ -154,7 +154,13 @@ export async function createPageEvent(ctx: FetchEvent) {
 	// const prevPath = ctx.request.headers.get("x-solid-referrer");
 	// const mutation = ctx.request.headers.get("x-solid-mutation") === "true";
 	const manifest = getSsrManifest(import.meta.env.SSR && import.meta.env.DEV ? "ssr": "client");
+
+	// Handle Vite build.cssCodeSplit
+	// When build.cssCodeSplit is false, a single CSS file is generated with the key style.css
+	const mergedCSS = import.meta.env.PROD ? await manifest.getAssets('style.css'): [];
+
 	const assets = [
+    ...mergedCSS,
     ...(await manifest.getAssets(import.meta.env.START_CLIENT_ENTRY)),
     ...(await manifest.getAssets(import.meta.env.START_APP_ENTRY)),
     // ...(import.meta.env.START_ISLANDS