SimpleDownloader already had range-based retry logic for truncated downloads (e.g. when the server closes the connection mid-stream), but ChunkedEncodingError, ConnectionError, and ContentDecodingError raised during iter_content bypassed that path and failed the download immediately.

This PR catches those exceptions during both the initial read and follow-up range requests, logs them at debug level, and lets the existing retry loop resume. Retry is skipped when content is decoded (content_encoding set and decode_content=True), since a partially decoded stream cannot be resumed with byte ranges.

Also fixes v1.B2Api not exposing api_config, and ensures decoded downloads still get truncation checks after download (hash verification remains skipped for them).