Fix: Profile picture upload issues and improved error handling

- account_settings.php: Show success message before reloading page (with 1.5s delay)
- upload_profile_picture.php: Reorder require statements for proper initialization, add file error code to error message

src/pages/other/account_settings.php

@@ -175,11 +175,11 @@ $user = $result->fetch_assoc();
                     }
 
                     if (response.status === 'success') {
-                        // Update the profile picture source with cache-busting query string
-                        // Reload the current page
-                        window.location.reload();
-
                         $('#responseMessage').html('<div class="alert alert-success">' + response.message + '</div>');
+                        // Reload the current page after a short delay
+                        setTimeout(function() {
+                            window.location.reload();
+                        }, 1500);
                     } else {
                         $('#responseMessage').html('<div class="alert alert-danger">' + response.message + '</div>');
                     }