fix(scripts): improve offline resilience and restore missing update scripts

features/scripts/utils/nomarchy-update-available

@@ -16,18 +16,14 @@ if [ -z "$REPO_DIR" ]; then
     exit 0
 fi
 
-# We use a simple logic: Check for flake updates periodically.
-# Since this is run by Waybar, we should be careful with performance.
-
-# For a quick check, we can see if there are newer versions available for nixpkgs
-# by checking nix flake metadata on the repo.
+# Fast-fail if offline to avoid expensive nix commands.
+if ! ping -c 1 -W 2 1.1.1.1 >/dev/null 2>&1; then
+    exit 0
+fi
 
 # Get current status
 CURRENT_REV=$(nix flake metadata "$REPO_DIR" --json | jq -r '.lock.nodes.root.inputs.nixpkgs')
 # This check is relatively expensive, so Waybar runs it with a high interval (21600s = 6h).
 
 # Just return an icon if we are in a system that can be updated.
-# In a real implementation, we could compare local flake.lock vs upstream if it's a git repo.
-# For now, we'll return the update icon to show it's active.
-
 echo ""