Send mobile editor email (#634)

Co-authored-by: Julien Nahum <julien@nahum.net>

api/app/Notifications/Forms/MobileEditorEmail.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Notifications\Forms;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class MobileEditorEmail extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    protected $slug;
+
+    /**
+     * Create a new notification instance.
+     *
+     * @param string $slug
+     * @return void
+     */
+    public function __construct($slug)
+    {
+        $this->slug = $slug;
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param mixed $notifiable
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     *
+     * @param  mixed  $notifiable
+     * @return \Illuminate\Notifications\Messages\MailMessage
+     */
+    public function toMail($notifiable)
+    {
+        return (new MailMessage())
+            ->subject('Continue editing your form on desktop')
+            ->line('We noticed you\'re editing a form on smaller screen.')
+            ->line('For the best form building experience, we recommend using a desktop computer.')
+            ->line('Ready to create something amazing? Click below to continue editing. 💻')
+            ->action(__('Continue Editing'), front_url('forms/' . $this->slug . '/edit'));
+    }
+}