feat: Add Spotify playlist import functionality

[harvey0100]

• Add spotify_client_id and spotify_client_secret config options
• Implement spotify command to import playlists from Spotify to TIDAL
• Add pagination support to fetch all tracks from large Spotify playlists
• Show helpful configuration instructions if credentials missing
• Add spotipy dependency for Spotify API access
• Improve progress display with single progress bar for all downloads
• Skip printing individual track progress messages during spotify download
• Show summary of tracks found/not found on TIDAL

The spotify command allows importing Spotify playlists by searching for
matching tracks on TIDAL. Requires configuring Spotify API credentials:

tidal-dl-ng cfg spotify_client_id YOUR_CLIENT_ID
tidal-dl-ng cfg spotify_client_secret YOUR_CLIENT_SECRET

Usage: tidal-dl-ng spotify "spotify-playlist-url"
Signed-off-by: Harvey Lynden

[exislow]

Thanks a lot for this PR. I have used https://www.tunemymusic.com/de/transfer/spotify-to-tidal before to save on this effort. But I guess this feature is nice to have implemented directly into this app. I will do quick review soon and give you some feedback.

[flesnuk]

Nice PR!
Could you improve the track import by matching by ISRC tag first? And then fallback to the text search if there isn't match.
ISRC allows for an exact matching between services and in most cases it would work and remove ambiguity.

[exislow]

@flesnuk: Thank you for this suggestion. I would also prefer this way.

@harvey0100: Is it possible for you to refactor your PR?

There is also some explanation in the readme missing. Especially how does the user obtains the client id and secret.

[exislow]

Quite a nice idea with a lot of potential. If you think it is worth it instead of using https://www.tunemymusic.com/de/transfer/tidal-to-spotify or something else like this, I would love to see you addressing our comments. Thanks, mate!

[harvey0100]

Hi @exislow i resolved all your comments, also have added album and track options for download also.
Please let me know what you think?

[djdrew52]

Great PR!

Would love to see this implemented further and in the GUI.

• Credential Login for Spotify
• Credential Login for Tidal
• Automated sync of playlists when new songs are added in Spotify
• Scheduling DLs of recently synced playlists (new items)

[little-fish]

Hello.
What a great addition.
Just wondering what should be done for the PR to be merged? @exislow , @harvey0100 .
Thank you guys.