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/services/GlobalStates.qml

@@ -0,0 +1,11 @@
+pragma Singleton
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import Quickshell
+
+Singleton {
+    id: root
+    property bool overviewOpen: false
+    property bool superReleaseMightTrigger: true
+}

modules/home/overview/services/HyprlandData.qml

@@ -0,0 +1,137 @@
+pragma Singleton
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import Quickshell.Hyprland
+
+/**
+ * Provides access to some Hyprland data not available in Quickshell.Hyprland.
+ */
+Singleton {
+    id: root
+    property var windowList: []
+    property var addresses: []
+    property var windowByAddress: ({})
+    property var workspaces: []
+    property var workspaceIds: []
+    property var workspaceById: ({})
+    property var activeWorkspace: null
+    property var monitors: []
+    property var layers: ({})
+
+    function updateWindowList() {
+        getClients.running = true;
+    }
+
+    function updateLayers() {
+        getLayers.running = true;
+    }
+
+    function updateMonitors() {
+        getMonitors.running = true;
+    }
+
+    function updateWorkspaces() {
+        getWorkspaces.running = true;
+        getActiveWorkspace.running = true;
+    }
+
+    function updateAll() {
+        updateWindowList();
+        updateMonitors();
+        updateLayers();
+        updateWorkspaces();
+    }
+
+    function biggestWindowForWorkspace(workspaceId) {
+        const windowsInThisWorkspace = HyprlandData.windowList.filter(w => w.workspace.id == workspaceId);
+        return windowsInThisWorkspace.reduce((maxWin, win) => {
+            const maxArea = (maxWin?.size?.[0] ?? 0) * (maxWin?.size?.[1] ?? 0);
+            const winArea = (win?.size?.[0] ?? 0) * (win?.size?.[1] ?? 0);
+            return winArea > maxArea ? win : maxWin;
+        }, null);
+    }
+
+    Component.onCompleted: {
+        updateAll();
+    }
+
+    Connections {
+        target: Hyprland
+
+        function onRawEvent(event) {
+            updateAll()
+        }
+    }
+
+    Process {
+        id: getClients
+        command: ["hyprctl", "clients", "-j"]
+        stdout: StdioCollector {
+            id: clientsCollector
+            onStreamFinished: {
+                root.windowList = JSON.parse(clientsCollector.text)
+                let tempWinByAddress = {};
+                for (var i = 0; i < root.windowList.length; ++i) {
+                    var win = root.windowList[i];
+                    tempWinByAddress[win.address] = win;
+                }
+                root.windowByAddress = tempWinByAddress;
+                root.addresses = root.windowList.map(win => win.address);
+            }
+        }
+    }
+
+    Process {
+        id: getMonitors
+        command: ["hyprctl", "monitors", "-j"]
+        stdout: StdioCollector {
+            id: monitorsCollector
+            onStreamFinished: {
+                root.monitors = JSON.parse(monitorsCollector.text);
+            }
+        }
+    }
+
+    Process {
+        id: getLayers
+        command: ["hyprctl", "layers", "-j"]
+        stdout: StdioCollector {
+            id: layersCollector
+            onStreamFinished: {
+                root.layers = JSON.parse(layersCollector.text);
+            }
+        }
+    }
+
+    Process {
+        id: getWorkspaces
+        command: ["hyprctl", "workspaces", "-j"]
+        stdout: StdioCollector {
+            id: workspacesCollector
+            onStreamFinished: {
+                root.workspaces = JSON.parse(workspacesCollector.text);
+                let tempWorkspaceById = {};
+                for (var i = 0; i < root.workspaces.length; ++i) {
+                    var ws = root.workspaces[i];
+                    tempWorkspaceById[ws.id] = ws;
+                }
+                root.workspaceById = tempWorkspaceById;
+                root.workspaceIds = root.workspaces.map(ws => ws.id);
+            }
+        }
+    }
+
+    Process {
+        id: getActiveWorkspace
+        command: ["hyprctl", "activeworkspace", "-j"]
+        stdout: StdioCollector {
+            id: activeWorkspaceCollector
+            onStreamFinished: {
+                root.activeWorkspace = JSON.parse(activeWorkspaceCollector.text);
+            }
+        }
+    }
+}

modules/home/overview/services/qmldir

@@ -0,0 +1,2 @@
+singleton HyprlandData 1.0 HyprlandData.qml
+singleton GlobalStates 1.0 GlobalStates.qml