shader step 2: hex grid with gradient colors and wave animation

modules/OverviewBackdrop.qml

@@ -25,9 +25,31 @@ PanelWindow {
         color: M.Theme.base01
     }
 
-    // Step 1: minimal shader test — should show solid red
     ShaderEffect {
+        id: fx
         anchors.fill: parent
         fragmentShader: Quickshell.shellPath("modules/hex_wave.frag.qsb")
+
+        property real uSize: 50.0
+        property real uWavePhase: -200
+        property vector4d uResolution: Qt.vector4d(width, height, 0, 0)
+        property color uC0: M.Theme.base0C
+        property color uC1: M.Theme.base0E
+        property color uC2: M.Theme.base09
+
+        // Wave animation: 6s sweep + 8s pause
+        SequentialAnimation on uWavePhase {
+            loops: Animation.Infinite
+            running: true
+            NumberAnimation {
+                from: -200
+                to: fx.width + 200
+                duration: 6000
+                easing.type: Easing.InOutSine
+            }
+            PauseAnimation {
+                duration: 8000
+            }
+        }
     }
 }