fix(lyrics-plus): use spclient endpoint to fetch tempo

[cvius]

Summary by CodeRabbit

• Chores
  • Switched the backend source for audio feature retrieval to improve reliability and tempo extraction accuracy.
• Bug Fixes
  • Reduced occurrences of incorrect or missing tempo information when analyzing tracks.

[coderabbitai]

📝 Walkthrough

Walkthrough

A single endpoint in the lyrics-plus app was changed: the audio-features fetch now uses an alternative Spotify URL (spclient.wg.spotify.com) with ?format=json. Tempo extraction logic and response semantics were left unchanged.

Changes

Cohort / File(s)	Summary
Spotify API Endpoint Update CustomApps/lyrics-plus/index.js	Replaced audio-features endpoint from https://api.spotify.com/v1/audio-features/{id} to https://spclient.wg.spotify.com/audio-attributes/v1/audio-features/{id}?format=json. Tempo is still read from the audio features response; handling unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A hop through code, a tiny URL swap,
The beat remains steady, it didn't stop,
Tempo found where it always lay,
New path, same rhythm, ready to play! 🎵

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately describes the main change: updating the tempo fetching implementation to use the spclient endpoint instead of the standard Spotify API endpoint.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

📝 Coding Plan

• Generate coding plan for human review comments

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