fix(files): a bare files/ prefix is not a path

Author: waleedlatif1

apps/sim/lib/vfs/path.ts

@@ -10,9 +10,12 @@ export class VfsPathError extends Error {
   }
 }
 
-/** A `files/…` workspace-file VFS path. File ids are drawn from `[A-Za-z0-9_-]`, so no id is one. */
+/**
+ * A `files/…` workspace-file VFS path naming something under the prefix. File ids are drawn from
+ * `[A-Za-z0-9_-]`, so no id is one.
+ */
 export function isWorkspaceFileVfsPath(reference: string): boolean {
-  return reference.startsWith('files/')
+  return reference.startsWith('files/') && reference.length > 'files/'.length
 }
 
 /**

apps/sim/lib/workspace-files/__integration__/file-path-references.integration.ts

@@ -150,6 +150,7 @@ describe('single-file operations addressed by VFS path', () => {
       code: 'not_found',
     })
     await expect(describeFile('files/Docs')).rejects.toMatchObject({ code: 'not_found' })
+    await expect(describeFile('files/')).rejects.toMatchObject({ code: 'not_found' })
     await expect(describeFile('files/only-here.csv')).rejects.toMatchObject({
       code: 'not_found',
     })