Function list_objects 

pub async fn list_objects(
    client: &Client,
    bucket: &str,
    prefix: &str,
    delimiter: Option<&str>,
    continuation_token: Option<&str>,
    max_keys: Option<i32>,
) -> Result<ListPage, AppError>

List objects under prefix in bucket using delimiter="/".

continuation_token chains pages returned by previous calls. max_keys defaults to 1 000 (the S3 maximum) when None.

Both Contents (objects) and CommonPrefixes (virtual folders) are mapped into the unified entries list. Virtual folders get is_prefix = true and are also preserved in common_prefixes.

Errors

Returns AppError::AccessDenied for permission failures, AppError::NotFound for NoSuchBucket, and AppError::Network for other SDK errors.