feat: Complete checkout overhaul with Stripe PaymentIntent integration and abandoned cart recovery

app/Mail/AbandonedCheckout.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Mail;
+
+use App\Models\Package;
+use App\Models\User;
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+
+class AbandonedCheckout extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    public function __construct(
+        public User $user,
+        public Package $package,
+        public string $timing, // '1h', '24h', '1w'
+        public string $resumeUrl
+    ) {
+        //
+    }
+
+    public function envelope(): Envelope
+    {
+        $subjectKey = 'emails.abandoned_checkout.subject_' . $this->timing;
+        return new Envelope(
+            subject: __('emails.abandoned_checkout.subject_' . $this->timing, [
+                'package' => $this->package->name
+            ]),
+        );
+    }
+
+    public function content(): Content
+    {
+        return new Content(
+            view: 'emails.abandoned-checkout',
+            with: [
+                'user' => $this->user,
+                'package' => $this->package,
+                'timing' => $this->timing,
+                'resumeUrl' => $this->resumeUrl,
+            ],
+        );
+    }
+
+    public function attachments(): array
+    {
+        return [];
+    }
+}