Initial commit for Greenlens

services/backend/userIdentityService.ts

@@ -0,0 +1,17 @@
+import * as SecureStore from 'expo-secure-store';
+
+const SESSION_KEY = 'greenlens_session_v3';
+
+export const getAuthToken = async (): Promise<string> => {
+  try {
+    const raw = await SecureStore.getItemAsync(SESSION_KEY);
+    if (raw) {
+      const session = JSON.parse(raw);
+      if (typeof session?.token === 'string' && session.token) {
+        return session.token;
+      }
+    }
+  } catch {}
+  // Return 'guest' instead of throwing to allow guest mode
+  return 'guest';
+};