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/StyledText.qml

@@ -0,0 +1,16 @@
+import QtQuick
+import ".."
+
+Text {
+    id: root
+    property bool animateChange: false
+
+    renderType: Text.NativeRendering
+    verticalAlignment: Text.AlignVCenter
+    font {
+        hintingPreference: Font.PreferFullHinting
+        family: Appearance?.font.family.main ?? "sans-serif"
+        pixelSize: Appearance?.font.pixelSize.small ?? 15
+    }
+    color: Appearance?.m3colors.m3onBackground ?? "white"
+}