Add Noctalia shell with Quickshell overview

- Add `noctalia` input to flake and lock it in `flake.lock`.
- Include `noctalia` and `quickshell` modules in `flake.nix`.
- Extend core packages to accept `inputs` and `system`; add
  `quickshell.nix`
  with required Qt6 packages and environment variables.
- Enable `upower` service for battery handling.
- Add home modules `noctalia.nix` and `overview.nix` (QML UI, README,
  assets, widgets, services) to provide a workspace overview.
- Comment out unused rofi and web‑search binds; update `exec‑once` to
  start
  the overview daemon and `noctalia-shell`.
- Provide `restart.noctalia` script and its Nix wrapper.
- Enable `noctalia-shell` in `stylix` configuration.

modules/home/overview/common/widgets/StyledToolTipContent.qml

@@ -0,0 +1,49 @@
+import QtQuick
+import "."
+import "../"
+
+Item {
+    id: root
+    required property string text
+    property bool shown: false
+    property real horizontalPadding: 10
+    property real verticalPadding: 5
+    implicitWidth: tooltipTextObject.implicitWidth + 2 * root.horizontalPadding
+    implicitHeight: tooltipTextObject.implicitHeight + 2 * root.verticalPadding
+
+    property bool isVisible: backgroundRectangle.implicitHeight > 0
+
+    Rectangle {
+        id: backgroundRectangle
+        anchors {
+            bottom: root.bottom
+            horizontalCenter: root.horizontalCenter
+        }
+        color: Appearance?.colors.colTooltip ?? "#3C4043"
+        radius: Appearance?.rounding.verysmall ?? 7
+        opacity: shown ? 1 : 0
+        implicitWidth: shown ? (tooltipTextObject.implicitWidth + 2 * root.horizontalPadding) : 0
+        implicitHeight: shown ? (tooltipTextObject.implicitHeight + 2 * root.verticalPadding) : 0
+        clip: true
+
+        Behavior on implicitWidth {
+            animation: Appearance?.animation.elementMoveFast.numberAnimation.createObject(this)
+        }
+        Behavior on implicitHeight {
+            animation: Appearance?.animation.elementMoveFast.numberAnimation.createObject(this)
+        }
+        Behavior on opacity {
+            animation: Appearance?.animation.elementMoveFast.numberAnimation.createObject(this)
+        }
+
+        StyledText {
+            id: tooltipTextObject
+            anchors.centerIn: parent
+            text: root.text
+            font.pixelSize: Appearance?.font.pixelSize.smaller ?? 14
+            font.hintingPreference: Font.PreferNoHinting
+            color: Appearance?.colors.colOnTooltip ?? "#FFFFFF"
+            wrapMode: Text.Wrap
+        }
+    }   
+}