Add lyrics fetching via LRCLIB

[lgmoneda]

PR to implement #110.

[Copilot]

Pull request overview

This PR adds lyrics fetching functionality via the LRCLIB API service, addressing issue #110.

Changes:

• Implements new smudge-lyrics.el module for fetching and displaying lyrics
• Adds keyboard binding ([prefix] l) and menu entries for accessing lyrics
• Introduces metadata hook in smudge-controller.el to notify other components of track changes

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
smudge-lyrics.el	New module implementing LRCLIB API integration, lyrics buffer display, and automatic/manual fetch capabilities
smudge.el	Integrates lyrics module with keyboard bindings and menu entries
smudge-controller.el	Adds metadata update hook to enable lyrics auto-fetching on track changes
README.md	Documents new lyrics feature, keybinding, and configuration options

Comments suppressed due to low confidence (1)

README.md:1

• Corrected spelling of 'isn't' to 'isn't' (removed double 'is').

# Smudge

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[danielfm]

Worked nicely here as well. Thanks!