fix: don't treat or as server-only modules, only (#14191)

Author: Rich-Harris

.changeset/all-days-nail.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: don't treat `$lib/server.ts` or `$lib/server_whatever.ts` as server-only modules, only `$lib/server/**`

packages/kit/src/exports/vite/index.js

@@ -583,7 +583,7 @@ async function kit({ svelte_config }) {
 				normalized === '$env/static/private' ||
 				normalized === '$env/dynamic/private' ||
 				normalized === '$app/server' ||
-				normalized.startsWith('$lib/server') ||
+				normalized.startsWith('$lib/server/') ||
 				(is_internal && server_only_pattern.test(path.basename(id)));
 
 			if (is_server_only) {