Build a lightweight iPhone utility that bundles several tiny, single‑purpose tools—like a quick tip calculator and a unit converter—and makes them available as actions in Shortcuts, via Siri, and from Spotlight. The app itself should be a simple settings hub where I can set a default tip percentage and choose common unit conversions, and those preferences should automatically apply whenever I run the actions. Everything must execute locally on‑device, and the integration should use the system’s App Intents/Intents framework so the actions are discoverable and configurable in Shortcuts.