fix: throw error when file can't be found in Vite manifest (#9558)

Prevents an infinite loop which makes debugging such errors harder

Author: dummdidumm

.changeset/great-ways-begin.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: throw error when file can't be found in Vite manifest

packages/kit/src/exports/vite/build/utils.js

@@ -72,7 +72,9 @@ export function find_deps(manifest, entry, add_dynamic_css) {
  */
 export function resolve_symlinks(manifest, file) {
 	while (!manifest[file]) {
-		file = path.relative('.', fs.realpathSync(file));
+		const next = path.relative('.', fs.realpathSync(file));
+		if (next === file) throw new Error(`Could not find file "${file}" in Vite manifest`);
+		file = next;
 	}
 
 	const chunk = manifest[file];