Why

Expo Orbit crashes when opened via deep link (open "expo-orbit:///download/?url=...") if the app is not already running.

Closes #311

How

The crash was caused by a race condition during app startup. The applicationWillFinishLaunching registers the Apple Event handler for URL schemes, but popoverManager is only initialized later in loadReactNativeWindow (called after super.applicationDidFinishLaunching). When macOS launches the app in response to a deep link, the URL Apple Event can be dispatched during super.applicationDidFinishLaunching (before popoverManager is set). Since popoverManager is declared as an implicitly unwrapped optional (PopoverManager!), accessing it while nil causes a SIGTRAP crash.

By using optional chaining on popoverManager, the function call is safely skipped if the manager isn't initialized yet. RCTLinkingManager will still receive the URL event, and the deep link gets processed once React Native finishes loading.

Test Plan

1. Quit Expo Orbit completely
2. Run open "expo-orbit:///download/?url=https%3A%2F%2Fexpo.dev%2Fartifacts%2Feas%2Ff33ukJUZmMKb88egay8Tra.tar.gz"
3. Verify the app launches without crashing and processes the deep link
4. With the app already running, run the same command and verify it still works