Improve upgrade process UX with better progress visibility

- Add step-by-step progress indicator (Preparing → Helper → Image → Restart)
- Display elapsed time during upgrade (MM:SS format)
- Show version transition in header (v4.0.0-beta.454 → v4.0.0-beta.456)
- Add expandable changelog preview before upgrading
- Reduce reload delay from 5s to 3s with countdown timer
- Add "Reload Now" button to skip countdown
- Improve status messages with step-specific descriptions
- Add success state with clear indication when upgrade completes
- Create new upgrade-progress component for visual step tracking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

app/Livewire/Upgrade.php

@@ -4,6 +4,7 @@ namespace App\Livewire;
 
 use App\Actions\Server\UpdateCoolify;
 use App\Models\InstanceSettings;
+use App\Services\ChangelogService;
 use Livewire\Component;
 
 class Upgrade extends Component
@@ -14,21 +15,57 @@ class Upgrade extends Component
 
     public string $latestVersion = '';
 
+    public string $currentVersion = '';
+
+    public array $changelogEntries = [];
+
     protected $listeners = ['updateAvailable' => 'checkUpdate'];
 
+    public function mount()
+    {
+        $this->currentVersion = config('constants.coolify.version');
+    }
+
     public function checkUpdate()
     {
         try {
             $this->latestVersion = get_latest_version_of_coolify();
+            $this->currentVersion = config('constants.coolify.version');
             $this->isUpgradeAvailable = data_get(InstanceSettings::get(), 'new_version_available', false);
             if (isDev()) {
                 $this->isUpgradeAvailable = true;
             }
+            $this->loadChangelog();
         } catch (\Throwable $e) {
             return handleError($e, $this);
         }
     }
 
+    public function loadChangelog()
+    {
+        try {
+            $service = app(ChangelogService::class);
+            $currentVersion = str_replace('v', '', $this->currentVersion);
+
+            $this->changelogEntries = $service->getEntries(1)
+                ->filter(function ($entry) use ($currentVersion) {
+                    $entryVersion = str_replace('v', '', $entry->tag_name);
+
+                    return version_compare($entryVersion, $currentVersion, '>');
+                })
+                ->take(3)
+                ->map(fn ($entry) => [
+                    'tag_name' => $entry->tag_name,
+                    'title' => $entry->title,
+                    'content_html' => $entry->content_html,
+                ])
+                ->values()
+                ->toArray();
+        } catch (\Throwable $e) {
+            $this->changelogEntries = [];
+        }
+    }
+
     public function upgrade()
     {
         try {