Build a React PWA called 'Improv Coach' using WebInfer and Web MIDI API. Chord progression engine: built-in standards (jazz standards, blues, common progressions) or user input. Backing track: play chords and bass via Web Audio. For each chord, generate note recommendations with generateObject: { chord: string, chordTones: number[], tensions: number[], avoidNotes: number[], scales: [{ name: string, notes: number[] }], suggestedPatterns: [{ name: string, notes: number[], description: string }] }. Visual keyboard: display 2-3 octaves, color code notes (green=chord tones, blue=tensions, red=avoid, gray=scale notes). MIDI output: for keyboards with key lights (like some Rolands), send MIDI to illuminate available notes. Hint levels: Full (all colors), Chord Tones Only, Scale Only, None. User plays via MIDI input, analyze their choices. Feedback: 'Nice tension on the 9th', 'That was an avoid note—hear the clash?'. Practice modes: freeze on one chord, slow changes, standard tempo. Lick library: show patterns that work over current chord, play demo, practice slowly. Progress: track accuracy over time.