mpris: cava audio visualizer overlay on album art

modules/Mpris.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import Quickshell
+import Quickshell.Io
 import Quickshell.Wayland
 import Quickshell.Services.Mpris
 import "." as M
@@ -33,6 +34,24 @@ M.BarSection {
         asynchronous: true
     }
 
+    // Cava visualizer — 16 bars, raw output mode
+    property var _cavaBars: Array(16).fill(0)
+    Process {
+        id: cavaProc
+        running: root.playing
+        command: ["sh", "-c",
+            "printf '[general]\\nbars=16\\nframerate=30\\n[output]\\nmethod=raw\\nraw_target=/dev/stdout\\ndata_format=ascii\\nascii_max_range=100\\n' | cava -p /dev/stdin 2>/dev/null"
+        ]
+        stdout: SplitParser {
+            splitMarker: "\n"
+            onRead: line => {
+                const vals = line.split(";").filter(s => s).map(Number);
+                if (vals.length >= 16)
+                    root._cavaBars = vals.map(v => v / 100);
+            }
+        }
+    }
+
     required property var bar
 
     property bool _panelHovered: false
@@ -208,6 +227,31 @@ M.BarSection {
                     }
                 }
 
+                // Visualizer bars
+                Row {
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    anchors.bottom: parent.bottom
+                    height: parent.height * 0.6
+                    spacing: 2
+                    visible: root.playing
+                    opacity: 0.5
+
+                    Repeater {
+                        model: 16
+                        Rectangle {
+                            required property int index
+                            width: (parent.width - 15 * parent.spacing) / 16
+                            height: parent.height * (root._cavaBars[index] ?? 0)
+                            anchors.bottom: parent.bottom
+                            color: M.Theme.base0E
+                            radius: 1
+
+                            Behavior on height { NumberAnimation { duration: 50 } }
+                        }
+                    }
+                }
+
                 Rectangle {
                     anchors.left: parent.left
                     anchors.right: parent.right