refactor(downloader): 🔧 reorganize TrackStreamInfo class and imports

* Moved `TrackStreamInfo` class definition from `download.py` to `downloader.py`.
* Removed redundant `dataclass` import from `download.py`.
* Updated import statements to maintain clarity and organization.

tidal_dl_ng/download.py

@@ -16,7 +16,6 @@ import tempfile
 import time
 from collections.abc import Callable
 from concurrent import futures
-from dataclasses import dataclass
 from threading import Event
 from uuid import uuid4
 
@@ -72,20 +71,10 @@ from tidal_dl_ng.helper.tidal import (
     name_builder_title,
 )
 from tidal_dl_ng.metadata import Metadata
-from tidal_dl_ng.model.downloader import DownloadSegmentResult
+from tidal_dl_ng.model.downloader import DownloadSegmentResult, TrackStreamInfo
 from tidal_dl_ng.model.gui_data import ProgressBars
 
 
-@dataclass
-class TrackStreamInfo:
-    """Container for track stream information."""
-
-    stream_manifest: StreamManifest | None
-    file_extension: str
-    requires_flac_extraction: bool
-    media_stream: Stream | None
-
-
 # TODO: Set appropriate client string and use it for video download.
 # https://github.com/globocom/m3u8#using-different-http-clients
 class RequestsClient: