fix(distro): fix /etc/nixos ownership, theme discovery, and CLI wrappers

- installer: set recursive ownership of /etc/nixos to main user post-install
- themes: fix NOMARCHY_PATH and discovery logic for Lua theme menu
- scripts: update CLI wrappers (font, theme, wallpaper) to use Walker menus
- core: remove obsolete NOMARCHY_PATH and cleanup dead code
- features: add pkgs.lua for Walker and remove obsolete switcher.nix
- docs: update ROADMAP.md, SCRIPTS.md and STRUCTURE.md

features/scripts/utils/nomarchy-font

@@ -15,6 +15,9 @@ case "$COMMAND" in
         nomarchy-font-list
         ;;
     selector|*)
-        nomarchy-font-selector
+        theme=$(echo -e "$(nomarchy-font-list)" | nomarchy-launch-walker --dmenu --width 350 -p "Font...")
+        if [[ -n "$theme" && "$theme" != "CNCLD" ]]; then
+            nomarchy-font-set "$theme"
+        fi
         ;;
 esac

features/scripts/utils/nomarchy-snapshot

@@ -3,7 +3,6 @@
 set -e
 
 COMMAND="$1"
-NOMARCHY_PATH=${NOMARCHY_PATH:-$HOME/.local/share/nomarchy}
 
 if [[ -z $COMMAND ]]; then
   echo "Usage: nomarchy-snapshot <create|restore>" >&2

features/scripts/utils/nomarchy-theme

@@ -15,6 +15,6 @@ case "$COMMAND" in
         nomarchy-theme-list
         ;;
     selector|*)
-        nomarchy-theme-selector
+        nomarchy-launch-walker -m menus:nomarchythemes --width 800 --minheight 400
         ;;
 esac

features/scripts/utils/nomarchy-wallpaper

@@ -10,14 +10,12 @@ case "$COMMAND" in
     set)
         shift
         # Wallpaper set usually involves writing to state.json and calling swww
-        # We can reuse the logic from nomarchy-wallpaper-selector if we extract it,
-        # but for now let's just trigger the selector.
-        nomarchy-wallpaper-selector
+        nomarchy-theme-bg-set "$@"
         ;;
     next)
         nomarchy-theme-bg-next
         ;;
     selector|*)
-        nomarchy-wallpaper-selector
+        nomarchy-launch-walker -m menus:nomarchyBackgroundSelector --width 800 --minheight 400
         ;;
 esac

features/scripts/utils/nomarchy-windows-vm

@@ -40,12 +40,6 @@ install_windows() {
 
   mkdir -p "$HOME/.windows"
   mkdir -p "$HOME/.config/windows"
-  mkdir -p "$HOME/.local/share/applications/icons"
-
-  # Install Windows VM icon and desktop file
-  if [[ -f $NOMARCHY_PATH/applications/icons/windows.png ]]; then
-    cp "$NOMARCHY_PATH/applications/icons/windows.png" "$HOME/.local/share/applications/icons/windows.png"
-  fi
 
   cat << EOF | tee "$HOME/.local/share/applications/windows-vm.desktop" > /dev/null
 [Desktop Entry]