Fix Syntax Errors in Remote Module Code Concatenation (#14728)

* Fix Syntax Errors in Remote Module Code Concatenation

Problem
Remote module transformation fails with syntax errors when the source file ends with an expression or a comment and does not include a trailing semicolon, space, or newline. This results in invalid concatenated code.

Root Cause
When Vite transforms .remote.js files, it concatenates the generated code with the original module. If the original module ends with an expression (e.g. console.log) or a comment without a trailing newline, the resulting code becomes syntactically invalid.

* chore: add changeset

* Apply suggestion from @dummdidumm

* Apply suggestion from @dummdidumm

---------

Co-authored-by: Simon H <[email protected]>

Author: Alazli

.changeset/fix-remote-trailing-content.md

@@ -0,0 +1,5 @@
+---
+"@sveltejs/kit": patch
+---
+
+fix: resolve remote module syntax errors with trailing expressions

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

@@ -755,7 +755,8 @@ async function kit({ svelte_config }) {
 			remotes.push(remote);
 
 			if (opts?.ssr) {
-				code += dedent`
+				// Extra newlines to prevent syntax errors around missing semicolons or comments
+				code += '\n\n' + dedent`
 					import * as $$_self_$$ from './${path.basename(id)}';
 					import { init_remote_functions as $$_init_$$ } from '@sveltejs/kit/internal';