Link notification preferences in email to settings page (#341)

Replace plain text "manage your notification preferences" line with a
direct markdown link to /dashboard/settings?tab=notifications in the
NewPluginAvailable email notification. Add test coverage for the link.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: simonhamp

app/Notifications/NewPluginAvailable.php

@@ -35,7 +35,7 @@ public function toMail(object $notifiable): MailMessage
             ->greeting('A new plugin is available!')
             ->line("**{$this->plugin->name}** has just been added to the NativePHP Plugin Marketplace.")
             ->action('View Plugin', route('plugins.show', $this->plugin->routeParams()))
-            ->line('You can manage your notification preferences in your account settings.');
+            ->line('[Manage your notification preferences]('.route('customer.settings', ['tab' => 'notifications']).').');
     }
 
     /**

package-lock.json

@@ -115,6 +115,22 @@ public function test_database_notification_contains_plugin_data(): void
         $this->assertEquals('View Plugin', $data['action_label']);
     }
 
+    public function test_mail_contains_notification_preferences_link(): void
+    {
+        $user = User::factory()->create();
+        $plugin = Plugin::factory()->for($user)->create();
+
+        $notification = new NewPluginAvailable($plugin);
+        $mail = $notification->toMail($user);
+
+        $expectedUrl = route('customer.settings', ['tab' => 'notifications']);
+        $found = collect($mail->introLines)->concat($mail->outroLines)->contains(function ($line) use ($expectedUrl) {
+            return str_contains($line, $expectedUrl);
+        });
+
+        $this->assertTrue($found, 'Mail should contain a link to the notification preferences page.');
+    }
+
     public function test_new_users_receive_new_plugin_notifications_by_default(): void
     {
         $user = User::factory()->create();