add missing features

AGENTS.md

@@ -47,7 +47,7 @@ cd mobile && npm run test:db
   - `db/` — SQLite persistence, see `mobile/AGENTS.md` for the full contract (schema, migrations, repositories, tests)
   - `localStorage.ts` — thin re-export of `services/db` (legacy alias)
 - `features/syncDevice.ts` — device sync orchestration (two-pass SAF walk, single transaction per root, `exists = 0` reconciliation)
-- `context/AuthContext.tsx` — session context
+- `context/AuthContext.tsx` — session context: exposes `deviceUserId` (bootstrapped from `getDeviceUserId()`) and starts the background `syncDevice` loop
 - No business logic on the client — heavy processing stays server-side
 - API base URL configured via `EXPO_PUBLIC_API_BASE_URL` env var (client + hooks not yet built)
 

mobile/context/AuthContext.tsx

@@ -1,19 +1,35 @@
 import { createContext, useContext, useEffect, useMemo, useState } from 'react';
 import type { ReactNode } from 'react';
 import { useSyncDevice } from '../features/syncDevice';
+import { getDeviceUserId } from '../services/localStorage';
 import type { AuthContextValue, User } from './AuthContext.types';
 
 const AuthContext = createContext<AuthContextValue | null>(null);
 
 export function AuthProvider({ children }: { children: ReactNode }) {
 
-  useEffect(()=>{
-    const {} = useSyncDevice()
-  },[])
-
   const [user, setUser] = useState<User | null>(null);
+  const [deviceUserId, setDeviceUserId] = useState<string | null>(null);
 
-  const value = useMemo(() => ({ user }), [user]);
+  useEffect(() => {
+    let active = true;
+    (async () => {
+      try {
+        const id = await getDeviceUserId();
+        if (active) setDeviceUserId(id);
+      } catch (error) {
+        console.warn('device identity unavailable', error);
+      }
+    })();
+
+    useSyncDevice();
+
+    return () => {
+      active = false;
+    };
+  }, []);
+
+  const value = useMemo(() => ({ user, deviceUserId }), [user, deviceUserId]);
 
   return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
 }

mobile/context/AuthContext.types.ts

@@ -2,4 +2,5 @@ export type User = {};
 
 export type AuthContextValue = {
   user: User | null;
+  deviceUserId: string | null;
 };

mobile/features/syncDevice.ts

@@ -122,8 +122,12 @@ export async function useSyncDevice(intervalMs = 30_000): Promise<void> {
   if (preferences.syncMode === 'none') return;
 
   while (true) {
+    try {
       const results = await syncDevice();
       console.info('syncDevice', JSON.stringify(results));
+    } catch (error) {
+      console.warn('syncDevice failed, retrying later', error);
+    }
     await new Promise((resolve) => setTimeout(resolve, intervalMs));
   }
 }