Add inactivity reminder emails

No app/Notifications existed beyond Laravel's stock email verification
and password reset - nothing brought lapsed users back. Adds a queued
InactivityReminder mail notification and a scheduled command
(app:send-inactivity-reminders, daily at 09:00) that emails verified
users with no completed workout session in the last 5 days, at most
once per 7-day cooldown so it can't spam. Skips brand-new signups so it
doesn't nag someone who registered an hour ago.

Verified the full pipeline live: scheduled command queues the
notification (QUEUE_CONNECTION=database), a queue worker processes it,
and the rendered email lands in the log driver with a working link back
to /workouts.

Production still needs cron actually invoking `php artisan schedule:run`
every minute and a running queue worker - that's part of the pending
deployment setup, not something this change can provide on its own.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Console/Commands/SendInactivityReminders.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\User;
+use App\Notifications\InactivityReminder;
+use Illuminate\Console\Command;
+
+class SendInactivityReminders extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'app:send-inactivity-reminders {--inactive-days=5} {--cooldown-days=7}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Email users who have not completed a workout session recently, at most once per cooldown period';
+
+    /**
+     * Execute the console command.
+     */
+    public function handle(): int
+    {
+        $inactiveSince = now()->subDays((int) $this->option('inactive-days'));
+        $cooldownSince = now()->subDays((int) $this->option('cooldown-days'));
+
+        $users = User::query()
+            ->whereNotNull('email_verified_at')
+            ->where('created_at', '<=', $inactiveSince)
+            ->whereDoesntHave('workoutSessions', function ($q) use ($inactiveSince) {
+                $q->whereNotNull('completed_at')->where('completed_at', '>=', $inactiveSince);
+            })
+            ->where(function ($q) use ($cooldownSince) {
+                $q->whereNull('last_reminder_sent_at')->orWhere('last_reminder_sent_at', '<', $cooldownSince);
+            })
+            ->get();
+
+        foreach ($users as $user) {
+            $user->notify(new InactivityReminder());
+            $user->last_reminder_sent_at = now();
+            $user->save();
+        }
+
+        $this->info("Sent inactivity reminders to {$users->count()} user(s).");
+
+        return self::SUCCESS;
+    }
+}

app/Models/User.php

@@ -74,6 +74,11 @@ class User extends Authenticatable
         return $this->hasMany(Program::class);
     }
 
+    public function workoutSessions()
+    {
+        return $this->hasMany(WorkoutSession::class);
+    }
+
     // Trainer/client relationships
     public function clients()
     {

app/Notifications/InactivityReminder.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class InactivityReminder extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @return array<int, string>
+     */
+    public function via(object $notifiable): array
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     */
+    public function toMail(object $notifiable): MailMessage
+    {
+        return (new MailMessage)
+            ->subject("We haven't seen you in a while, {$notifiable->name}")
+            ->line('It has been a few days since your last completed workout.')
+            ->line('A short session today is better than a perfect one you keep putting off.')
+            ->action('Start a Workout', route('workouts.index'))
+            ->line('See you back soon!');
+    }
+}