Detect Steam's Factorio install on macOS in the installer (#1195)

Steam on macOS puts Factorio in ~/Library/Application Support/Steam/steamapps/common/Factorio, with the app bundle inside it. Point at factorio.app/Contents like the existing /Applications entry, since that's where data/ lives and the host finds MacOS/factorio next to it.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

packages/create/create.js

@@ -46,6 +46,10 @@ const factorioLocations = {
 	],
 	darwin: [
 		"/Applications/factorio.app/Contents",
+		path.join(
+			os.homedir(), "Library", "Application Support", "Steam", "steamapps", "common", "Factorio",
+			"factorio.app", "Contents",
+		),
 	],
 };