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/SmallDiskUsageButton.qml

@@ -11,6 +11,7 @@ Rectangle {
 
     property string mountPath: "/"
     property string instanceId: ""
+    property bool showMountPath: true
 
     property var selectedMount: {
         if (!DgopService.diskMounts || DgopService.diskMounts.length === 0)
@@ -67,7 +68,7 @@ Rectangle {
         DankIcon {
             anchors.verticalCenter: parent.verticalCenter
             name: "storage"
-            size: Theme.iconSizeSmall
+            size: Theme.iconSizeLarge
             color: {
                 if (root.usagePercent > 90)
                     return Theme.error;
@@ -82,6 +83,7 @@ Rectangle {
             spacing: 0
 
             StyledText {
+                visible: root.showMountPath
                 text: root.selectedMount?.mount || root.mountPath
                 font.pixelSize: Theme.fontSizeSmall
                 color: Theme.surfaceVariantText
@@ -92,7 +94,7 @@ Rectangle {
 
             StyledText {
                 text: `${root.usagePercent.toFixed(0)}%`
-                font.pixelSize: Theme.fontSizeSmall
+                font.pixelSize: root.showMountPath ? Theme.fontSizeSmall : Theme.fontSizeLarge
                 font.weight: Font.Bold
                 color: {
                     if (root.usagePercent > 90)