feat(auth): centralize token storage

contexts/UserContext.tsx

@@ -8,6 +8,7 @@ import React, {
 import { User } from '../types';
 import { databaseService } from '../services/database';
 import { authService } from '../services/auth/auth.service';
+import { tokenStorage } from '../utils/token';
 
 const SESSION_KEY = 'medication_app_session';
 
@@ -78,8 +79,10 @@ export const UserProvider: React.FC<{ children: ReactNode }> = ({
 
       console.warn('Updated user with last login:', updatedUser);
 
-      // Store access token for subsequent API calls.
-      localStorage.setItem('access_token', result.accessToken);
+      tokenStorage.save({
+        accessToken: result.accessToken,
+        refreshToken: result.refreshToken,
+      });
       // Set the user from the login result
       setUser(updatedUser);
 
@@ -123,7 +126,10 @@ export const UserProvider: React.FC<{ children: ReactNode }> = ({
 
       console.warn('Updated OAuth user with last login:', updatedUser);
 
-      localStorage.setItem('access_token', result.accessToken);
+      tokenStorage.save({
+        accessToken: result.accessToken,
+        refreshToken: result.refreshToken,
+      });
       setUser(updatedUser);
 
       console.warn('OAuth user set in context');
@@ -152,6 +158,7 @@ export const UserProvider: React.FC<{ children: ReactNode }> = ({
   };
 
   const logout = () => {
+    tokenStorage.clear();
     setUser(null);
   };