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/retro-82/btop.theme

@@ -0,0 +1,63 @@
+# Main background, empty for terminal default, need to be empty if you want transparent background
+theme[main_bg]=""
+
+# Main text color
+theme[main_fg]="#f6dcac"
+
+# Title color for boxes
+theme[title]="#3f8f8a"
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#8cbfb8"
+
+# Background color of selected item in processes box
+theme[selected_bg]="#134e5a"
+
+# Foreground color of selected item in processes box
+theme[selected_fg]="#f6dcac"
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#134e5a"
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#3f8f8a"
+
+# Box outline and divider line color
+theme[cpu_box]="#e97b3c"
+theme[mem_box]="#e97b3c"
+theme[net_box]="#e97b3c"
+theme[proc_box]="#e97b3c"
+theme[div_line]="#134e5a"
+
+# Gradient for all meters and graphs
+theme[temp_start]="#a7c9c6"
+theme[temp_mid]="#8cbfb8"
+theme[temp_end]="#028391"
+
+theme[cpu_start]="#a7c9c6"
+theme[cpu_mid]="#e97b3c"
+theme[cpu_end]="#f85525"
+
+theme[free_start]="#faa968"
+theme[free_mid]="#e97b3c"
+theme[free_end]="#f85525"
+
+theme[cached_start]="#faa968"
+theme[cached_mid]="#e97b3c"
+theme[cached_end]="#f85525"
+
+theme[available_start]="#faa968"
+theme[available_mid]="#e97b3c"
+theme[available_end]="#f85525"
+
+theme[used_start]="#faa968"
+theme[used_mid]="#e97b3c"
+theme[used_end]="#f85525"
+
+theme[download_start]="#faa968"
+theme[download_mid]="#e97b3c"
+theme[download_end]="#f85525"
+
+theme[upload_start]="#faa968"
+theme[upload_mid]="#e97b3c"
+theme[upload_end]="#f85525"