feat: add async prerequisite installation with retry logic and visual feedback

This commit enhances the boarding flow to handle prerequisite installation asynchronously with proper retry logic and user feedback:

- Add retry mechanism with max 3 attempts for prerequisite installation
- Display live installation logs via ActivityMonitor during boarding
- Reset ActivityMonitor state when starting new activity to prevent stale event dispatching
- Support dynamic header updates in ActivityMonitor
- Add prerequisitesInstalled event handler to revalidate after installation completes
- Extract validation logic into continueValidation() method for cleaner flow
- Add unit tests for prerequisite installation logic

This improves UX by showing users real-time progress during prerequisite installation and handles installation failures gracefully with automatic retries.

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

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

resources/views/livewire/activity-monitor.blade.php

@@ -5,7 +5,7 @@
 ])>
     @if ($activity)
         @if (isset($header))
-            <div class="flex gap-2 pb-2 flex-shrink-0">
+            <div class="flex gap-2 pb-2 flex-shrink-0" @if ($isPollingActive) wire:poll.1000ms @endif>
                 <h3>{{ $header }}</h3>
                 @if ($isPollingActive)
                     <x-loading />

resources/views/livewire/boarding/index.blade.php

@@ -546,6 +546,13 @@
                                 </div>
                             </div>
 
+                            @if ($prerequisiteInstallAttempts > 0)
+                                <div class="p-6 bg-neutral-50 dark:bg-coolgray-200 rounded-lg border border-neutral-200 dark:border-coolgray-400">
+                                    <h3 class="font-bold text-black dark:text-white mb-4">Installing Prerequisites</h3>
+                                    <livewire:activity-monitor header="Prerequisites Installation Logs" :showWaiting="false" />
+                                </div>
+                            @endif
+
                             <x-slide-over closeWithX fullScreen>
                                 <x-slot:title>Server Validation</x-slot:title>
                                 <x-slot:content>