refactor pesantissimo dei Customer Files

lib/core/widgets/pdf_viewer_widget.dart

@@ -1,5 +1,6 @@
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:flux/core/utils/functions.dart';
 import 'package:get_it/get_it.dart';
 import 'package:pdfx/pdfx.dart';
 import 'package:internet_file/internet_file.dart';
@@ -39,11 +40,7 @@ class _PdfViewerWidgetState extends State<PdfViewerWidget> {
         pdfData = widget.bytes!;
       } else if (widget.storagePath != null && widget.storagePath!.isNotEmpty) {
         // SCENARIO 2: Pratica salvata, scarichiamo da Supabase (Remoto)
-        final signedUrl = await GetIt.I
-            .get<SupabaseClient>()
-            .storage
-            .from('documents')
-            .createSignedUrl(widget.storagePath!, 60);
+        final signedUrl = await getSignedUrl(widget.storagePath!);
         pdfData = await InternetFile.get(signedUrl);
       } else {
         throw Exception("Nessun documento trovato");