feat(lstmobile): intial scanner setup kinda working

lstMobile/src/lib/storage.ts

@@ -0,0 +1,36 @@
+
+import AsyncStorage from "@react-native-async-storage/async-storage";
+
+export type AppConfig = {
+  serverUrl: string;
+  scannerId: string;
+};
+
+const CONFIG_KEY = "scanner_app_config";
+
+export async function saveConfig(config: AppConfig) {
+
+  await AsyncStorage.setItem(CONFIG_KEY, JSON.stringify(config));
+}
+
+export async function getConfig(): Promise<AppConfig | null> {
+  const raw = await AsyncStorage.getItem(CONFIG_KEY);
+
+  if (!raw) return null;
+
+  try {
+    return JSON.parse(raw) as AppConfig;
+  } catch (error) {
+    console.log("Error", error)
+    return null;
+  }
+}
+
+export function hasValidConfig(config: AppConfig | null) {
+  if (!config) return false;
+
+  return Boolean(
+    config.serverUrl?.trim() &&
+    config.scannerId?.trim()
+  );
+}

lstMobile/src/lib/versionValidation.ts

@@ -0,0 +1,43 @@
+
+
+export type ServerVersionInfo = {
+  packageName: string;
+  versionName: string;
+  versionCode: number;
+  minSupportedVersionCode: number;
+  fileName: string;
+};
+
+export type StartupStatus =
+  | { state: "checking" }
+  | { state: "needs-config" }
+  | { state: "offline" }
+  | { state: "blocked"; reason: string; server: ServerVersionInfo }
+  | { state: "warning"; message: string; server: ServerVersionInfo }
+  | { state: "ready"; server: ServerVersionInfo | null };
+
+export function evaluateVersion(
+  appBuildCode: number,
+  server: ServerVersionInfo
+): StartupStatus {
+  if (appBuildCode < server.minSupportedVersionCode) {
+    return {
+      state: "blocked",
+      reason: "This scanner app is too old and must be updated before use.",
+      server,
+    };
+  }
+
+  if (appBuildCode !== server.versionCode) {
+    return {
+      state: "warning",
+      message: `A newer version is available. Installed build: ${appBuildCode}, latest build: ${server.versionCode}.`,
+      server,
+    };
+  }
+
+  return {
+    state: "ready",
+    server,
+  };
+}