Fix MUSIC_PATH direct mount + backend URL prefill

- MUSIC_PATH is now used 1:1 inside the container (no /music remapping)
- config.js 404-safe with inline fallback defaults
- Prefill uses .trim() so empty strings don't overwrite fields

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

.env.example

@@ -4,8 +4,9 @@
 NAVIDROME_URL=https://music.yourdomain.com
 BACKEND_URL=https://novasonic-api.yourdomain.com
 
-# Path to your Navidrome music library on the host
-MUSIC_PATH=/path/to/your/navidrome/music
+# Absolute path to your Navidrome music library on the host
+# This exact path is used inside the container — no subdirectory is added
+MUSIC_PATH=/srv/navidrome/music
 
 AUDIO_FMT=mp3          # mp3 | flac | opus | best
 AUDIO_QUALITY=0        # 0 = best quality

app.js

@@ -111,8 +111,8 @@ window.addEventListener('load',()=>{
   const saved=localStorage.getItem('ns_cfg');
   if(saved){cfg=JSON.parse(saved);startApp()}
   // Autofill URLs from Docker env (set via config.js)
-  if(window.NS_SERVER_URL){const el=document.getElementById('srv-url');if(el&&!el.value)el.value=window.NS_SERVER_URL;}
-  if(window.NS_BACKEND_URL){const el=document.getElementById('backend-url');if(el&&!el.value)el.value=window.NS_BACKEND_URL;}
+  if(window.NS_SERVER_URL?.trim()){const el=document.getElementById('srv-url');if(el&&!el.value)el.value=window.NS_SERVER_URL.trim();}
+  if(window.NS_BACKEND_URL?.trim()){const el=document.getElementById('backend-url');if(el&&!el.value)el.value=window.NS_BACKEND_URL.trim();}
   document.getElementById('srv-pass').addEventListener('keydown',e=>{if(e.key==='Enter')doConnect()});
   audio.addEventListener('timeupdate',updateProgress);
   audio.addEventListener('ended',onEnded);

docker-compose.yml

@@ -19,12 +19,12 @@ services:
     working_dir: /app
     volumes:
       - ./backend/novasonic-server.js:/app/novasonic-server.js:ro
-      - ${MUSIC_PATH:-/music}:/music   # your Navidrome music library
+      - ${MUSIC_PATH}:${MUSIC_PATH}      # exact path from .env, no remapping
     ports:
-      - "3700:3700"                    # route this port through your reverse proxy
+      - "3700:3700"                      # route this port through your reverse proxy
     environment:
       - PORT=3700
-      - MUSIC_PATH=/music
+      - MUSIC_PATH=${MUSIC_PATH}         # same path inside the container
       - AUDIO_FMT=${AUDIO_FMT:-mp3}
       - AUDIO_QUALITY=${AUDIO_QUALITY:-0}
       - MAX_PARALLEL=${MAX_PARALLEL:-2}

index.html

@@ -13,7 +13,8 @@
 <link rel="preconnect" href="https://fonts.googleapis.com">
 <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@300;400;500&display=swap" rel="stylesheet">
 <link rel="stylesheet" href="styles.css">
-<script src="config.js"></script>
+<script>window.NS_SERVER_URL='';window.NS_BACKEND_URL='';</script>
+<script src="config.js" onerror="0"></script>
 <script src="app.js" defer></script>
 </head>
 <body>

sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v17';
+const CACHE = 'ns-v18';
 const PRECACHE = ['/', 'index.html', 'styles.css', 'app.js', 'sw.js', 'manifest.json', 'icon.svg'];
 const SKIP_URLS = ['/rest/stream', '/rest/download', '/config.js'];