Remove volume slider from song view

- Removed volume slider UI component
- Removed unused IconVolume function
- Volume is now always at 100% (default browser behavior)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

web/src/pages/SongPage.tsx

@@ -170,15 +170,6 @@ function IconPause() {
   );
 }
 
-function IconVolume() {
-  return (
-    <svg width="14" height="14" viewBox="0 0 14 14" fill="currentColor" style={{ opacity: 0.4 }}>
-      <path d="M2 5h3l4-3v10l-4-3H2V5z" />
-      <path d="M10.5 4.5C11.5 5.5 11.5 8.5 10.5 9.5" stroke="currentColor" strokeWidth="1.2" fill="none" strokeLinecap="round" />
-    </svg>
-  );
-}
-
 // ── WaveformPins — rendered in a div above the WaveSurfer canvas ───────────────
 
 function WaveformPins({
@@ -619,17 +610,7 @@ export function SongPage() {
               {isReady && duration > 0 ? ` / ${formatTime(duration)}` : ""}
             </span>
 
-            {/* Volume */}
+
-            <div style={{ display: "flex", alignItems: "center", gap: 7, marginLeft: "auto" }}>
-              <IconVolume />
-              <input
-                type="range"
-                min={0}
-                max={100}
-                defaultValue={80}
-                style={{ WebkitAppearance: "none", width: 70, height: 3, background: "rgba(255,255,255,0.1)", borderRadius: 2, outline: "none", cursor: "pointer" }}
-              />
-            </div>
           </div>