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.

bin/appearance/nomarchy-theme-install

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# nnomarchy-theme-install: Install a new theme from a git repo for Nnomarchy
+# Usage: nnomarchy-theme-install <git-repo-url>
+
+if [[ -z $1 ]]; then
+  echo -e "\e[32mSee https://manuals.omamix.org/2/the-nnomarchy-manual/90/extra-themes\n\e[0m"
+  REPO_URL=$(gum input --placeholder="Git repo URL for theme" --header="")
+else
+  REPO_URL="$1"
+fi
+
+if [[ -z $REPO_URL ]]; then
+  exit 1
+fi
+
+THEMES_DIR="$HOME/.config/nnomarchy/themes"
+THEME_NAME=$(basename "$REPO_URL" .git | sed -E 's/^nnomarchy-//; s/-theme$//')
+THEME_PATH="$THEMES_DIR/$THEME_NAME"
+
+# Remove existing theme if present
+if [[ -d $THEME_PATH ]]; then
+  rm -rf "$THEME_PATH"
+fi
+
+# Clone the repo directly to ~/.config/nnomarchy/themes
+if ! git clone "$REPO_URL" "$THEME_PATH"; then
+  echo "Error: Failed to clone theme repo."
+  exit 1
+fi
+
+# Apply the new theme with nnomarchy-theme-set
+nnomarchy-theme-set $THEME_NAME