When no active approval workflow exists, ApprovalService::submit() was
silently returning, leaving the request in Draft while showing a false
success message. Now throws a RuntimeException as a safety net, and the
Livewire component guards before creating any records and shows a clear
error to the user.
- Make dark mode toggle reactive using Alpine x-data theme property
- Apply saved theme on page load via data-bs-theme attribute binding
- Remove hardcoded bg-light classes that broke dark mode styling
- Fix duplicate/broken Bootstrap bundle import in app.js
