mobile: prevent login/signup request when loading

apps/mobile/app/components/auth/signup.js

@@ -67,6 +67,7 @@ export const Signup = ({ changeMode, trial }) => {
 
   const signup = async () => {
     if (!validateInfo() || error) return;
+    if (loading) return;
     setLoading(true);
     try {
       await db.user.signup(email.current.toLowerCase(), password.current);

apps/mobile/app/components/auth/use-login.js

@@ -64,6 +64,7 @@ export const useLogin = (onFinishLogin) => {
   const login = async () => {
     if (!validateInfo() || error) return;
     try {
+      if (loading) return;
       setLoading(true);
       switch (step) {
         case LoginSteps.emailAuth: {