feat: Make spotishell ok with Feb 2026 Spotify API changes

[Domochip]

I received a Spotify communication about some API endpoint evolutions

They provide a migration guide :
https://developer.spotify.com/documentation/web-api/tutorials/february-2026-migration-guide

Need to be checked

[wardbox]

Audit Results

Ran a full codebase audit against the February 2026 migration guide. Here's what we found:

Good news: Per Spotify's follow-up, endpoint restrictions for existing Development Mode apps are postponed until further notice. Only the Premium requirement, 5-user cap, and 1 Client ID limit took effect on March 9. New apps created after Feb 11 are already restricted.

~31 files affected across these categories:

Category	Files	Notes
Library endpoints → /me/library	19	All save/remove/check endpoints in Library/ and Follow/
Playlist /tracks → /items	5	Straightforward rename
Batch fetch endpoints removed	5	Get-Track, Get-Album, Get-Artist, Get-Episode, Get-Show need per-ID refactor
Browse/Discovery removed	4	No replacement — must deprecate Get-NewReleases, Get-Category, Get-CategoryPlaylists, Get-ArtistTopTracks
User endpoints removed	3	Get-UserProfile, Get-UserPlaylists, New-Playlist need /me equivalents
Search limit max 50→10	1	Search-Spotify needs limit adjustment
Response fields removed/renamed	Many	popularity, available_markets, external_ids, etc. gone from responses

Will track individual work items in separate issues. No immediate action required for existing apps, but we should start migrating incrementally so we're ready when Spotify sets a firm date.

[wardbox]

Tracking

Work broken out into individual issues:

• Migrate library endpoints to /me/library #71 — Migrate library endpoints to /me/library
• Rename playlist /tracks endpoints to /items #72 — Rename playlist /tracks to /items (PR Rename playlist /tracks endpoints to /items #77)
• Refactor batch fetch endpoints to individual calls #73 — Refactor batch fetch to individual calls
• Deprecate removed browse/discovery endpoints #74 — Deprecate removed browse/discovery endpoints
• Migrate user endpoints to /me equivalents #75 — Migrate user endpoints to /me equivalents
• Update Search-Spotify limit constraints (max 50→10) #76 — Update search limit constraints
• Release v2.0.0 - Spotify Feb 2026 API migration #78 — Release v2.0.0

Will close this issue once all of the above are resolved.