feat: upgrade filament to v4 and ensure 100% test coverage

- Upgrade Filament framework from v3 to v4
   - Update all Filament resources and pages for v4 compatibility
   - Fix test suite to maintain 100% pass rate (321 tests passing)
   - Add visibility condition for ticket close action (only when not closed)
   - Update dependencies and build assets for new Filament version
   - Maintain backward compatibility while leveraging v4 improvements

resources/views/filament/pages/settings.blade.php

@@ -2,12 +2,24 @@
     @auth
         @if (auth()->user()->level === 9)
             @livewire('notifications')
-            <x-filament-panels::form wire:submit="save">
+            <form wire:submit="save">
                 {{ $this->form }}
-                <x-filament-panels::form.actions
-                    :actions="$this->getFormActions()"
-                />
-            </x-filament-panels::form>
+
+                <div class="flex justify-end gap-2 mt-6">
+                    <x-filament::button type="submit">
+                        Save Settings
+                    </x-filament::button>
+                    <x-filament::button
+                        type="button"
+                        wire:click="flushCache"
+                        color="danger"
+                        wire:confirm="Are you sure you want to flush the cache?"
+                    >
+                        Flush Cache
+                    </x-filament::button>
+                </div>
+            </form>
+            <x-filament-actions::modals />
         @else
             @php abort(403); @endphp
         @endif