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

app/Livewire/Frontend/Mailbox.php

@@ -2,6 +2,8 @@
 
 namespace App\Livewire\Frontend;
 
+use Exception;
+use App\Models\Email;
 use App\ColorPicker;
 use App\Models\Message;
 use App\Models\ZEmail;
@@ -78,7 +80,7 @@ class Mailbox extends Component
                 $this->dispatch('showNewMailNotification', $notification);
             }
             ZEmail::incrementMessagesStats(count($notifications));
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
             if (Auth::check() && Auth::user()->level == 9) {
                 $this->error = $e->getMessage();
             } else {
@@ -96,7 +98,7 @@ class Mailbox extends Component
                 Message::find($messageId)->delete();
             }
             if (config('app.fetch_from_db')) {
-                \App\Models\Email::where(['message_id' => $messageId])->delete();
+                Email::where(['message_id' => $messageId])->delete();
             }
             $this->deleted[] = $messageId;
             foreach ($this->messages as $key => $message) {
@@ -108,7 +110,7 @@ class Mailbox extends Component
             }
 
         } catch (
-            \Exception $exception
+            Exception $exception
         ) {
             Log::error($exception->getMessage());
         }