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/Premium.php

@@ -2,6 +2,10 @@
 
 namespace App\Models;
 
+use Ddeboer\Imap\ConnectionInterface;
+use DateTime;
+use Exception;
+use Log;
 use App\ColorPicker;
 use Carbon\Carbon;
 use Ddeboer\Imap\Search\Email\Cc;
@@ -15,7 +19,7 @@ use Illuminate\Support\Facades\Cookie;
 class Premium extends Model
 {
     use ColorPicker;
-    public static function connectMailBox($imap = null): \Ddeboer\Imap\ConnectionInterface
+    public static function connectMailBox($imap = null): ConnectionInterface
     {
         $imapDB = json_decode(config('app.settings.imap_settings'), true);
         $imap = [
@@ -67,7 +71,7 @@ class Premium extends Model
             $sender = $message->getFrom();
             $date = $message->getDate();
             if (!$date) {
-                $date = new \DateTime();
+                $date = new DateTime();
                 if ($message->getHeaders()->get('udate')) {
                     $date->setTimestamp($message->getHeaders()->get('udate'));
                 }
@@ -126,7 +130,7 @@ class Premium extends Model
                                     $directory . $attachment->getFilename(),
                                     $attachment->getDecodedContent()
                                 );
-                            } catch (\Exception $e) {
+                            } catch (Exception $e) {
                                 \Illuminate\Support\Facades\Log::error($e->getMessage());
                             }
                         }
@@ -527,8 +531,8 @@ class Premium extends Model
                 $usageLog->emails_created_history = $history;
                 $usageLog->save();
             }
-        } catch (\Exception $exception) {
-            \Log::error($exception->getMessage());
+        } catch (Exception $exception) {
+            Log::error($exception->getMessage());
         }
 
     }