settings(dbar): add bar inset padding UI opts in framemode/stanalone

Fixes #2597

quickshell/Modules/Settings/FrameTab.qml

@@ -12,6 +12,9 @@ Item {
     LayoutMirroring.enabled: I18n.isRtl
     LayoutMirroring.childrenInherit: true
 
+    // Bar Inset Padding: resolve the "auto" sentinel (stored < 0) to the frame thickness for the slider display.
+    readonly property int frameInsetPaddingDisplay: SettingsData.frameBarInsetPadding < 0 ? Math.round(SettingsData.frameThickness) : SettingsData.frameBarInsetPadding
+
     DankFlickable {
         anchors.fill: parent
         clip: true
@@ -158,6 +161,27 @@ Item {
                     }
                 }
 
+                SettingsSliderRow {
+                    id: frameBarInsetPaddingSlider
+                    settingKey: "frameBarInsetPadding"
+                    tags: ["frame", "bar", "edge", "inset", "padding", "corner", "end"]
+                    text: I18n.tr("Bar Inset Padding")
+                    description: I18n.tr("Gap between the end widgets and the bar ends (0 = edge-to-edge)")
+                    unit: "px"
+                    minimum: 0
+                    maximum: 48
+                    step: 1
+                    defaultValue: Math.round(SettingsData.frameThickness)
+                    value: root.frameInsetPaddingDisplay
+                    onSliderDragFinished: v => SettingsData.set("frameBarInsetPadding", v)
+
+                    Binding {
+                        target: frameBarInsetPaddingSlider
+                        property: "value"
+                        value: root.frameInsetPaddingDisplay
+                    }
+                }
+
                 SettingsToggleRow {
                     id: frameBlurToggle
                     settingKey: "frameBlurEnabled"