feat: add support for original image dimension in album covers

Adds functionality to handle original image dimensions (`origin`) for album cover downloads.

- ✨ Added `PxORIGIN` option to cover dimension constants.
- 🔄 Updated cover image URL logic to support original dimensions.
- 🛠️ Improved cover data handling for more flexible metadata embedding.

This enhances customization and fidelity in cover image management.

tidal_dl_ng/constants.py

@@ -37,6 +37,7 @@ class CoverDimensions(StrEnum):
     Px320: str = "320"
     Px640: str = "640"
     Px1280: str = "1280"
+    PxORIGIN: str = "origin"
 
 
 class TidalLists(StrEnum):

tidal_dl_ng/download.py

@@ -38,6 +38,7 @@ from tidal_dl_ng.constants import (
     PLAYLIST_EXTENSION,
     PLAYLIST_PREFIX,
     REQUESTS_TIMEOUT_SEC,
+    CoverDimensions,
     MediaType,
     QualityVideo,
 )
@@ -1183,7 +1184,10 @@ class Download:
             path_lyrics = self.lyrics_to_file(path_media.parent, lyrics)
 
         if self.settings.data.metadata_cover_embed or (self.settings.data.cover_album_file and is_parent_album):
-            url_cover = track.album.image(int(self.settings.data.metadata_cover_dimension))
+            cover_dimension = self.settings.data.metadata_cover_dimension
+            url_cover = track.album.image(
+                int(cover_dimension) if cover_dimension != CoverDimensions.PxORIGIN else cover_dimension
+            )
             cover_data = self.cover_data(url=url_cover)
 
         if cover_data and self.settings.data.cover_album_file and is_parent_album: