complete story 8.8 with qa tests

app/Mail/TimelineUpdateEmail.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Mail;
+
+use App\Models\TimelineUpdate;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+
+class TimelineUpdateEmail extends BaseMailable
+{
+    public function __construct(
+        public TimelineUpdate $update
+    ) {
+        $this->locale = $this->update->timeline->user->preferred_language ?? 'ar';
+    }
+
+    public function envelope(): Envelope
+    {
+        $caseName = $this->update->timeline->case_name;
+
+        $subject = $this->locale === 'ar'
+            ? "تحديث على قضيتك: {$caseName}"
+            : "Update on your case: {$caseName}";
+
+        return new Envelope(
+            subject: $subject,
+        );
+    }
+
+    public function content(): Content
+    {
+        return new Content(
+            markdown: "emails.timeline.update.{$this->locale}",
+            with: [
+                'update' => $this->update,
+                'timeline' => $this->update->timeline,
+                'user' => $this->update->timeline->user,
+            ],
+        );
+    }
+}

app/Observers/TimelineUpdateObserver.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Observers;
+
+use App\Enums\TimelineStatus;
+use App\Mail\TimelineUpdateEmail;
+use App\Models\TimelineUpdate;
+use Illuminate\Support\Facades\Mail;
+
+class TimelineUpdateObserver
+{
+    public function created(TimelineUpdate $update): void
+    {
+        // Only send for active timelines
+        if ($update->timeline->status !== TimelineStatus::Active) {
+            return;
+        }
+
+        $client = $update->timeline->user;
+
+        Mail::to($client->email)->queue(
+            new TimelineUpdateEmail($update)
+        );
+    }
+}

app/Providers/AppServiceProvider.php

@@ -4,7 +4,9 @@ namespace App\Providers;
 
 use App\Listeners\LogFailedLoginAttempt;
 use App\Models\Consultation;
+use App\Models\TimelineUpdate;
 use App\Observers\ConsultationObserver;
+use App\Observers\TimelineUpdateObserver;
 use Illuminate\Auth\Events\Failed;
 use Illuminate\Support\Facades\Event;
 use Illuminate\Support\ServiceProvider;
@@ -27,5 +29,6 @@ class AppServiceProvider extends ServiceProvider
         Event::listen(Failed::class, LogFailedLoginAttempt::class);
 
         Consultation::observe(ConsultationObserver::class);
+        TimelineUpdate::observe(TimelineUpdateObserver::class);
     }
 }