feat(system): comprehensive branding, styling, and system feature update

- Relocate themes to assets/themes/ and update all references.
- Implement custom SDDM theme and Plymouth theme enhancements.
- Add themed templates for Alacritty, Hyprland, Waybar, and other apps.
- Introduce Makima key remapper module and configuration.
- Add Voxtype and Walker configurations.
- Implement systemd power management and timeout optimizations.
- Add Nautilus-python extensions for LocalSend.
- Update branding assets and ASCII art integration.

config/nomarchy/default/walker/walker.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Walker
+Comment=Walker Service
+Exec=walker --gapplication-service
+StartupNotify=false
+Terminal=false
+Type=Application