feat: auth screen with auto-redirect, sync favorites/history with backend

.agents/skills/vercel-react-native-skills/rules/react-compiler-destructure-functions.md

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+---
+title: Destructure Functions Early in Render (React Compiler)
+impact: HIGH
+impactDescription: stable references, fewer re-renders
+tags: rerender, hooks, performance, react-compiler
+---
+
+## Destructure Functions Early in Render
+
+This rule is only applicable if you are using the React Compiler.
+
+Destructure functions from hooks at the top of render scope. Never dot into
+objects to call functions. Destructured functions are stable references; dotting
+creates new references and breaks memoization.
+
+**Incorrect (dotting into object):**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton(props) {
+  const router = useRouter()
+
+  // bad: react-compiler will key the cache on "props" and "router", which are objects that change each render
+  const handlePress = () => {
+    props.onSave()
+    router.push('/success') // unstable reference
+  }
+
+  return <Button onPress={handlePress}>Save</Button>
+}
+```
+
+**Correct (destructure early):**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton({ onSave }) {
+  const { push } = useRouter()
+
+  // good: react-compiler will key on push and onSave
+  const handlePress = () => {
+    onSave()
+    push('/success') // stable reference
+  }
+
+  return <Button onPress={handlePress}>Save</Button>
+}
+```