feat(mobile): Expo → RN CLI 전환 + Android 빌드 성공

RN 0.85 + React 19 기반 apps/mobile-rn 프로젝트 생성.
6개 화면 이식 (Login, Dash, History, Record, Talk, Settings).
@react-navigation/native + bottom-tabs 네비게이션 구성.
Windows NDK CMake libc++_shared 링크 버그 워크아라운드 포함.
Galaxy Fold (SM_F956N) 무선 디버깅 APK 설치 확인.

apps/mobile-rn/src/lib/auth-context.tsx

@@ -0,0 +1,55 @@
+// src/lib/auth-context.tsx — Auth provider using Supabase
+import { createContext, useContext, useEffect, useState, useCallback } from 'react'
+import type { ReactNode } from 'react'
+import type { User, Session } from '@supabase/supabase-js'
+import { supabase } from './supabase'
+
+interface AuthContextValue {
+  user: User | null
+  session: Session | null
+  loading: boolean
+  devBypass: () => void
+}
+
+const AuthContext = createContext<AuthContextValue>({
+  user: null,
+  session: null,
+  loading: true,
+  devBypass: () => {},
+})
+
+export function AuthProvider({ children }: { children: ReactNode }): React.ReactElement {
+  const [user, setUser] = useState<User | null>(null)
+  const [session, setSession] = useState<Session | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    supabase.auth.getSession().then(({ data: { session: s } }) => {
+      setSession(s)
+      setUser(s?.user ?? null)
+      setLoading(false)
+    })
+
+    const { data: { subscription } } = supabase.auth.onAuthStateChange((_event, s) => {
+      setSession(s)
+      setUser(s?.user ?? null)
+    })
+
+    return () => subscription.unsubscribe()
+  }, [])
+
+  const devBypass = useCallback(() => {
+    setUser({ id: 'dev-user', email: 'dev@d3ro.local' } as User)
+    setLoading(false)
+  }, [])
+
+  return (
+    <AuthContext.Provider value={{ user, session, loading, devBypass }}>
+      {children}
+    </AuthContext.Provider>
+  )
+}
+
+export function useAuth(): AuthContextValue {
+  return useContext(AuthContext)
+}

apps/mobile-rn/src/lib/supabase.ts

@@ -0,0 +1,25 @@
+// src/lib/supabase.ts — Supabase client for RN
+import 'react-native-url-polyfill/auto'
+import AsyncStorage from '@react-native-async-storage/async-storage'
+import { createClient, type SupabaseClient } from '@supabase/supabase-js'
+
+// TODO: move to env config or supabase-config.ts
+const SUPABASE_URL = ''
+const SUPABASE_ANON_KEY = ''
+
+export const supabase: SupabaseClient = createClient(
+  SUPABASE_URL,
+  SUPABASE_ANON_KEY,
+  {
+    auth: {
+      storage: AsyncStorage,
+      autoRefreshToken: true,
+      persistSession: true,
+      detectSessionInUrl: false,
+    },
+  }
+)
+
+export function isSupabaseConfigured(): boolean {
+  return SUPABASE_URL.length > 0 && SUPABASE_ANON_KEY.length > 0
+}