Fix relativeResolve to return normalized paths

- Wrap path.relative result with normalizePath for cross-platform consistency
- Handle empty string case to avoid converting '' to '.'
- Update test to expect forward slashes instead of platform-specific separators
- Remove unused path import from utils test

Author: jdalton

registry/src/lib/path.ts

@@ -440,5 +440,10 @@ export function trimLeadingDotSlash(pathLike: string | Buffer | URL): string {
  */
 /*@__NO_SIDE_EFFECTS__*/
 export function relativeResolve(from: string, to: string): string {
-  return getPath().relative(from, to)
+  const relative = getPath().relative(from, to)
+  // Empty string means same path - don't normalize to '.'
+  if (relative === '') {
+    return ''
+  }
+  return normalizePath(relative)
 }

test/registry/utils.test.mts

@@ -1,5 +1,3 @@
-import path from 'node:path'
-
 import { describe, expect, it } from 'vitest'
 
 // Helper functions moved to outer scope.
@@ -232,7 +230,7 @@ describe('utility modules tests', () => {
 
     it('should get relative path', () => {
       expect(pathUtils.relativeResolve('/a/b', '/a/b/c')).toBe('c')
-      expect(pathUtils.relativeResolve('/a/b', '/a/d')).toBe(`..${path.sep}d`)
+      expect(pathUtils.relativeResolve('/a/b', '/a/d')).toBe('../d')
     })
   })
 })