fix(quickshell): stabilize control center numeric widths (#1943)

quickshell/Widgets/NumericText.qml

@@ -0,0 +1,22 @@
+import QtQuick
+import qs.Common
+
+StyledText {
+    id: root
+
+    property string reserveText: ""
+    readonly property real reservedWidth: reserveText !== "" ? Math.max(contentWidth, reserveMetrics.width) : contentWidth
+
+    isMonospace: true
+    wrapMode: Text.NoWrap
+
+    StyledTextMetrics {
+        id: reserveMetrics
+        isMonospace: root.isMonospace
+        font.pixelSize: root.font.pixelSize
+        font.family: root.font.family
+        font.weight: root.font.weight
+        font.hintingPreference: root.font.hintingPreference
+        text: root.reserveText
+    }
+}