feat: show update notification

Displays a notice on the root page when a new version is available.

resources/views/welcome.blade.php

@@ -34,7 +34,37 @@
     @auth
         @if(config('app.version'))
             <flux:text class="text-xs">Version: <a href="https://github.com/usetrmnl/byos_laravel/releases/"
-                                                   target="_blank">{{ config('app.version') }}</a></flux:text>
+                                                   target="_blank">{{ config('app.version') }}</a>
+            </flux:text>
+
+            @php
+                $response = Cache::remember('latest_release', 86400, function () {
+                     try {
+                         $response = Http::get('https://api.github.com/repos/usetrmnl/byos_laravel/releases/latest');
+                         if ($response->successful()) {
+                             return $response->json();
+                         }
+                     } catch (\Exception $e) {
+                         Log::debug('Failed to fetch latest release: ' . $e->getMessage());
+                     }
+                     return null;
+                 });
+                 $latestVersion = Arr::get($response, 'tag_name');
+                 
+                 if ($latestVersion && version_compare($latestVersion, config('app.version'), '>')) {
+                     $newVersion = $latestVersion;
+                 }
+            @endphp
+
+            @if(isset($newVersion))
+                <flux:callout class="text-xs mt-6" icon="arrow-down-circle">
+                    <flux:callout.heading>Update available</flux:callout.heading>
+                    <flux:callout.text>
+                        There is a newer version {{ $newVersion }} available. Update to the latest version for the best experience.
+                        <flux:callout.link href="https://github.com/usetrmnl/byos_laravel/releases/" target="_blank">Release notes</flux:callout.link>
+                    </flux:callout.text>
+                </flux:callout>
+            @endif
         @endif
     @endauth
 </x-layouts.auth.card>