feat: Fretboard Editor / Chord Lookup

[ElBeh]

Description

Interactive guitar fretboard tool for looking up and building chords.
Two directions: enter a chord name to see all voicings on the fretboard,
or click positions on the fretboard to identify the chord.

Requirements

• Interactive fretboard component (clickable positions, visual feedback)
• Chord → Fretboard: enter chord name, display all common voicings
• Fretboard → Chord: click positions, identify and name the chord
• Chord library with standard voicings (consider tonal.js for music theory)
• Visual chord diagram display (fretboard grid with dot markers)
• Optional: insert chord shape as ASCII into the tab editor

Open Questions

• Standalone mode (third tab next to Practice/Band) vs. integrated panel alongside the tab editor? Panel would allow direct insertion into tabs.
• Scope of chord recognition: basic triads + 7ths, or extended chords (9ths, 11ths, altered)?