Initial commit: split single-file PWA into index.html, styles.css, app.js, sw.js

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# NovaSonic
+
+A self-hosted music streaming PWA for Navidrome / Subsonic-compatible backends.
+
+## Stack
+
+- `index.html` — app shell
+- `styles.css` — all styles
+- `app.js` — frontend logic
+- `sw.js` — service worker (offline caching)
+
+## Setup
+
+Point the app at your Navidrome server URL on first launch.
+
+## Docker
+
+```bash
+docker compose up -d
+```