refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

core/system/scripts/nomarchy-brightness-display-apple

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Adjust the brightness on Apple Studio Displays and Apple XDR Displays using asdcontrol.
+
+if (( $# == 0 )); then
+  echo "Adjust Apple Display Brightness by passing +5000 or -5000 (or any range from 0-60000)"
+else
+  device="$(sudo asdcontrol --detect /dev/usb/hiddev* | grep ^/dev/usb/hiddev | cut -d: -f1)"
+  sudo asdcontrol "$device" -- "$1" >/dev/null
+  value="$(sudo asdcontrol "$device" | awk -F= '/BRIGHTNESS=/{print $2+0}')"
+  nomarchy-swayosd-brightness "$(( value * 100 / 60000 ))"
+fi