feat(control-center): add DiskUsage widget config overlay with showMountPath toggle and standardized tile sizing (#2507)

* feat(control-center): add widget config overlay with showMountPath toggle for DiskUsage

Introduces WidgetConfigOverlay and DiskUsageWidgetConfigMenu components, allowing
users to toggle mount path visibility per DiskUsage widget in edit mode

* refactor(control-center): use Theme.iconSizeLarge and Theme.fontSizeLarge for small tiles

Standardize SmallDiskUsageButton and SmallBatteryButton sizing with Theme.iconSizeLarge
and Theme.fontSizeLarge, and unify font weight to Font.Bold on both tile widgets.

* fix(control-center): adjust SmallDiskUsageButton font size based on showMountPath

* refactor(control-center): simplify DiskUsage config menu i18n strings

Remove the redundant "Disk Usage Widget" title and the toggle description
to reduce translatable strings

quickshell/Modules/ControlCenter/Widgets/DiskUsagePill.qml

@@ -8,6 +8,7 @@ CompoundPill {
 
     property string mountPath: "/"
     property string instanceId: ""
+    property bool showMountPath: true
 
     iconName: "storage"
 
@@ -37,6 +38,9 @@ CompoundPill {
         if (!selectedMount) {
             return I18n.tr("No disk data");
         }
+        if (!showMountPath) {
+            return I18n.tr("Disk Usage");
+        }
         return selectedMount.mount;
     }