refactor(scanner): more basic work to get the scanner just running

lstMobile/src/app/index.tsx

@@ -0,0 +1,72 @@
+import { useRouter } from "expo-router";
+import { useEffect, useState } from "react";
+import { ActivityIndicator, Text, View } from "react-native";
+import { useAppStore } from "../hooks/useAppStore";
+import { devDelay } from "../lib/devMode";
+
+export default function Index() {
+	const router = useRouter();
+	const [message, setMessage] = useState(<Text>Starting app...</Text>);
+
+	const hasHydrated = useAppStore((s) => s.hasHydrated);
+	const serverPort = useAppStore((s) => s.serverPort);
+	const hasValidSetup = useAppStore((s) => s.hasValidSetup);
+
+	useEffect(() => {
+		if (!hasHydrated) {
+			setMessage(<Text>Loading app...</Text>);
+			return;
+		}
+
+		const startup = async () => {
+			try {
+				await devDelay(1500);
+
+				setMessage(<Text>Validating data...</Text>);
+				await devDelay(1500);
+
+				if (!hasValidSetup()) {
+					router.replace("/setup");
+					return;
+				}
+
+				setMessage(<Text>Checking scanner mode...</Text>);
+				await devDelay(1500);
+
+				if (parseInt(serverPort || "0", 10) >= 50000) {
+					setMessage(
+						<Text>
+							Starting normal alplaprod scanner that has no LST rules
+						</Text>,
+					);
+					await devDelay(1500);
+					router.replace("/setup");
+					return;
+				}
+
+				setMessage(<Text>Opening LST scan app</Text>);
+				await devDelay(3250);
+				router.replace("/scanner");
+			} catch (error) {
+				console.log("Startup error", error);
+				setMessage(<Text>Something went wrong during startup.</Text>);
+			}
+		};
+
+		startup();
+	}, [hasHydrated, hasValidSetup, serverPort, router]);
+
+	return (
+		<View
+			style={{
+				flex: 1,
+				justifyContent: "center",
+				alignItems: "center",
+				marginTop: 12,
+			}}
+		>
+			{message}
+			<ActivityIndicator size="large" />
+		</View>
+	);
+}