Add waveform rendering on playback

.env.example

@@ -175,6 +175,20 @@ MEDIASESSION=true
 # album art as tracks change.
 DYNAMIC_META=true
 
+# Real-time scrolling waveform (Web Audio), shown after the listener presses
+# play. It routes playback through Web Audio, so if your STREAM_URL is on a
+# DIFFERENT origin than the site it must send an Access-Control-Allow-Origin
+# header — set WAVEFORM_STREAM_CORS=true once it does, or the waveform is
+# auto-disabled to avoid silencing the audio. Same-origin streams need nothing.
+WAVEFORM_ENABLED=false
+WAVEFORM_HEIGHT=72
+# Bar color; blank uses your THEME_ACCENT.
+WAVEFORM_COLOR=""
+# Seconds of history shown across the width before peaks scroll off.
+WAVEFORM_WINDOW_SECONDS=30
+# Set true only if a cross-origin stream sends CORS headers.
+WAVEFORM_STREAM_CORS=false
+
 
 # -----------------------------------------------------------------------------
 #  Listeners / history