fix: add Xcode Cloud ci_post_clone.sh to build Safari extension assets

Xcode Cloud clones the repo without distros/ (gitignored). This script
installs Node.js via Homebrew, runs npm install + npm run build, and
populates distros/safari/ before the Xcode build step.

Author: vveerrgg

ci_scripts/ci_post_clone.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# Xcode Cloud post-clone script
+# Installs Node.js and builds the Safari extension assets into distros/safari/
+
+set -e
+
+echo "=== NostrKey CI: Installing Node.js ==="
+
+# Xcode Cloud provides Homebrew
+brew install node
+
+echo "=== NostrKey CI: node $(node --version), npm $(npm --version) ==="
+
+echo "=== NostrKey CI: Installing dependencies ==="
+cd "$CI_PRIMARY_REPOSITORY_PATH"
+npm install
+
+echo "=== NostrKey CI: Building Safari extension ==="
+npm run build
+
+echo "=== NostrKey CI: Verifying build output ==="
+ls -la distros/safari/
+
+echo "=== NostrKey CI: Build complete ==="