chore(branding): update fastfetch ASCII icon and fix branding typos

- Optimized assets/branding/icon.txt with multi-color placeholders for fastfetch.
- Updated config/fastfetch/config.jsonc to use the new multi-colored icon.
- Added icon and svg branding assets to modules/home/theme-files.nix.
- Fixed 'Nnomarchy' typo to 'Nomarchy' and updated branding paths in several scripts.
- Corrected screensaver and welcome scripts to use the centralized branding assets.

bin/utils/nomarchy-welcome

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-FLAG_FILE="$HOME/.config/nnomarchy/.first-run-done"
+FLAG_FILE="$HOME/.config/nomarchy/.first-run-done"
 
 if [ -f "$FLAG_FILE" ]; then
     exit 0
@@ -16,28 +16,28 @@ fi
 gum style \
 	--foreground 212 --border-foreground 212 --border double \
 	--align center --width 50 --margin "1 2" --padding "2 4" \
-	"Nnomarchy" "The NixOS Distribution with Nomarchy Flavour"
+	"Nomarchy" "The NixOS Distribution with Nomarchy Flavour"
 
 echo "Welcome! Let's personalize your new system."
 echo ""
 
 # 1. Select initial theme
 echo "Step 1: Choose your starting theme"
-nnomarchy-theme-selector
+nomarchy-theme-set "$(nomarchy-theme-list | gum filter --placeholder 'Select a theme...')"
 
 # 2. Select initial font
 echo "Step 2: Choose your preferred font"
-nnomarchy-font-selector
+nomarchy-font-set "$(nomarchy-font-list | gum filter --placeholder 'Select a font...')"
 
 # 3. Setup Local Repo (Crucial for env-update to work)
 echo ""
-echo "Nnomarchy relies on a local git repository for declarative updates."
+echo "Nomarchy relies on a local git repository for declarative updates."
 if [ ! -d "/etc/nixos/.git" ]; then
     echo "Warning: /etc/nixos is not a git repository. Declarative updates might fail."
     if gum confirm "Would you like to initialize /etc/nixos as a git repo?"; then
         sudo git -C /etc/nixos init
         sudo git -C /etc/nixos add .
-        sudo git -C /etc/nixos commit -m "Initial Nnomarchy System Commit"
+        sudo git -C /etc/nixos commit -m "Initial Nomarchy System Commit"
     fi
 fi
 
@@ -45,5 +45,5 @@ fi
 mkdir -p "$(dirname "$FLAG_FILE")"
 touch "$FLAG_FILE"
 
-gum style --foreground 82 "Setup complete! Enjoy your Nnomarchy experience."
+gum style --foreground 82 "Setup complete! Enjoy your Nomarchy experience."
 sleep 3