- icon.svg / icon-192/512.png: blue→purple equalizer gradient design
- nginx.conf: add /app/ alias so reverse-proxy prefix resolves assets
- vite.config.js: base /app/ + %BASE_URL% in favicon links so path
resolves correctly whether app is served at / or /app/
- ic_launcher.xml: same equalizer design for Android app icon
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>