chore: update import-map to use-vibes 0.19.4-dev-vibes-refactor

Avoids esm.sh caret resolution issue where 0.18.9-dev-vibes-refactor
was being upgraded to 0.18.28-dev with incompatible dependencies.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jchris

vibes.diy/pkg/app/config/import-map.ts

@@ -3,7 +3,7 @@
  * Used by: root.tsx, eject-template.ts, hosting packages
  */
 
-const VIBES_VERSION = "0.18.9";
+const VIBES_VERSION = "0.19.4-dev-vibes-refactor";
 
 export function getLibraryImportMap() {
   return {