Offer a new share as a QR code and through the share sheet

The share created page gets "Show QR code", a dialog with the link as a
QR code (black on white, full screen on a phone) that downloads as a PNG
drawn in the browser, with a password reminder for protected shares; and
"Share…", which opens the device's share sheet where there is one. Both
carry only the link.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

resources/js/app.js

@@ -1,2 +1,3 @@
 // Livewire Material. Alpine is bundled and started by Livewire 4: never import it here as well.
 import '../../vendor/nonameweb/livewire-material/resources/js/material.js'
+import './share-created.js'