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.

assets/themes/ethereal/colors.toml

@@ -0,0 +1,23 @@
+accent = "#7d82d9"
+cursor = "#ffcead"
+foreground = "#ffcead"
+background = "#060B1E"
+selection_foreground = "#060B1E"
+selection_background = "#ffcead"
+
+color0 = "#060B1E"
+color1 = "#ED5B5A"
+color2 = "#92a593"
+color3 = "#E9BB4F"
+color4 = "#7d82d9"
+color5 = "#c89dc1"
+color6 = "#a3bfd1"
+color7 = "#F99957"
+color8 = "#6d7db6"
+color9 = "#faaaa9"
+color10 = "#c4cfc4"
+color11 = "#f7dc9c"
+color12 = "#c2c4f0"
+color13 = "#ead7e7"
+color14 = "#dfeaf0"
+color15 = "#ffcead"