1. app.js was importing and starting Alpine manually, but Livewire 3/4
   already bundles Alpine. Two instances meant $wire magic was unavailable.
   Now app.js just registers the focus plugin via Livewire's alpine:init hook.

2. Wizard x-data used @entangle which compiled to the old
   window.Livewire.find(id).entangle() syntax. Replaced with $wire getters
   which is the canonical Livewire 3+ approach.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>