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