refactor: modernize WaferMapTab layout and redesign ReadoutPanel statistics display

src/pygui/ISC/Tabs/WaferMapTab.qml

@@ -26,8 +26,8 @@ Item {
 
     ColumnLayout {
         anchors.fill: parent
-        anchors.margins: Theme.panelPadding
-        spacing: Theme.rightPaneGap
+        anchors.margins: 16
+        spacing: 16
 
         // ── Toolbar ───────────────────────────────────────────────────────
         RowLayout {
@@ -176,7 +176,7 @@ Item {
         RowLayout {
             Layout.fillWidth: true
             Layout.fillHeight: true
-            spacing: Theme.rightPaneGap
+            spacing: 16
 
             // Source panel — bordered card
             Rectangle {
@@ -207,6 +207,18 @@ Item {
                     showLabels: readoutPanel.showLabels
                 }
 
+                // Horizontal separation line with vertical padding
+                Item {
+                    Layout.fillWidth: true
+                    implicitHeight: 32
+                    Rectangle {
+                        anchors.centerIn: parent
+                        width: parent.width
+                        height: 1
+                        color: Theme.cardBorder
+                    }
+                }
+
                 TransportBar { Layout.fillWidth: true }
             }