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/Models/ZEmail.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Ddeboer\Imap\ConnectionInterface;
 use Ddeboer\Imap\Search\Email\To;
 use Ddeboer\Imap\Server;
 use Illuminate\Database\Eloquent\Model;
@@ -11,7 +12,7 @@ use function str_replace;
 
 class ZEmail extends Model
 {
-    public static function connectMailBox($imap = null): \Ddeboer\Imap\ConnectionInterface
+    public static function connectMailBox($imap = null): ConnectionInterface
     {
         if ($imap === null) {
             $imap = json_decode(config('app.settings.imap_settings'), true);