refactor: Updated the craft.vite.asset() function to work with Vite…

… 3.x or later, where assets are stored as top-level entries in the `manifest.json` ([#56](nystudio107/craft-vite#56)) ([#31](nystudio107/craft-vite#31))

src/services/ViteService.php

@@ -366,7 +366,11 @@ public function manifestAsset(string $path): string
             }
         }
 
-        return '';
+        // With Vite 3.x or later, the assets are also included as top-level entries in the
+        // manifest, so check there, too
+        $entry = ManifestHelper::extractEntry($path);
+
+        return $entry === '' ? '' : FileHelper::createUrl($this->serverPublic, $entry);
     }
 
     /**