f1941a90db
- index.html: add <audio id=player> (hidden), beat-indicator dot in header - index.html: animation selector panel with Beat Pulse/Strobe/Color Wave/Rainbow options - index.html: remove seek slider + time display (browser audio element has native controls) - index.html: upload button + file selector remain in transport bar - app.js: wire <audio> element — play/pause/seeked/timeupdate events send WS ticks - app.js: 10Hz setInterval tick loop (supplements native timeupdate ~4Hz) - app.js: WS beat message -> flashBeatIndicator() animation - app.js: loadWaveformAndBeats() draws waveform peaks + beat marker lines on canvas - app.js: loadSelectedFile() sets audio.src=/shows/filename, fetches beats+waveform - app.js: upload response caches beat data returned from server immediately - style.css: .beat-indicator with .beat-flash (yellow glow animation) - style.css: .animation-select-input for the animations panel dropdown