fix reveal mask not latching - move phase check into shader effect

shell/lock/LockSurface.qml

@@ -25,23 +25,22 @@ WlSessionLockSurface {
 
     // Overlay group: blur + dim + hexes, revealed per-pixel by wave position
     Item {
+        id: _overlay
         anchors.fill: parent
         opacity: _unlockFade
 
         property bool _revealed: false
+        onVisibleChanged: _revealed = false
 
         layer.enabled: !_revealed
         layer.effect: ShaderEffect {
             property real uPhase: _hexWave.wavePhase
             property real uWidth: root.width
             fragmentShader: Quickshell.shellPath("modules/reveal_mask.frag.qsb")
-        }
 
-        Connections {
-            target: _hexWave
-            function onWavePhaseChanged() {
-                if (!parent._revealed && _hexWave.wavePhase >= root.width)
-                    parent._revealed = true;
+            onUPhaseChanged: {
+                if (!_overlay._revealed && uPhase >= _overlay.width)
+                    _overlay._revealed = true;
             }
         }
 
@@ -60,12 +59,6 @@ WlSessionLockSurface {
             }
         }
 
-        // Dim overlay
-        Rectangle {
-            anchors.fill: parent
-            color: Qt.rgba(S.Theme.base00.r, S.Theme.base00.g, S.Theme.base00.b, 0.4)
-        }
-
         // Hex wave
         C.HexWaveBackground {
             id: _hexWave