fix: ensure injected paths are prefixed with ./

.changeset/plenty-cougars-wave.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare': patch
+---
+
+fix: ensure manifest paths are relative when building worker

packages/adapter-cloudflare/index.js

@@ -119,9 +119,11 @@ export default function (options = {}) {
 				replace: {
 					// the paths returned by the Wrangler config might be Windows paths,
 					// so we need to convert them to POSIX paths or else the backslashes
-					// will be interpreted as escape characters and create an incorrect import path
-					SERVER: `${posixify(path.relative(worker_dest_dir, builder.getServerDirectory()))}/index.js`,
-					MANIFEST: `${posixify(path.relative(worker_dest_dir, tmp))}/manifest.js`,
+					// will be interpreted as escape characters and create an incorrect import path.
+					// We also need to ensure the relative imports start with ./ since Wrangler
+					// errors if a relative import looks like a package import
+					SERVER: `./${posixify(path.relative(worker_dest_dir, builder.getServerDirectory()))}/index.js`,
+					MANIFEST: `./${posixify(path.relative(worker_dest_dir, tmp))}/manifest.js`,
 					ASSETS: assets_binding
 				}
 			});