Use encoded email, otp in login URL in email & web app sign-in flow

Previously emails with url special characters would not get
successfully identified for login. Account creation was fine due to
email being in POST request body. But login with such emails did not
work due to query params not being escaped before being sent to server

This change escapes both the code and email in login URL sent to
server. So login with emails containing special characters like
`email+khoj@gmail.com' works. It fixes both the URL web app sent by
web app directly and the magic link sent to users to their email

This change also fixes accessibility issue of having a DialogTitle in
DialogContent for screen readers.

Resolves #1090

src/interface/web/app/components/loginPrompt/loginPrompt.tsx

@@ -2,7 +2,7 @@
 
 import styles from "./loginPrompt.module.css";
 import { Button } from "@/components/ui/button";
-import { Dialog, DialogContent } from "@/components/ui/dialog";
+import { Dialog, DialogContent, DialogTitle } from "@/components/ui/dialog";
 import { Input } from "@/components/ui/input";
 import Autoplay from "embla-carousel-autoplay";
 import {
@@ -27,6 +27,7 @@ import {
 } from "@/components/ui/carousel";
 import { Card, CardContent } from "@/components/ui/card";
 import { InputOTP, InputOTPGroup, InputOTPSlot } from "@/components/ui/input-otp";
+import * as VisuallyHidden from "@radix-ui/react-visually-hidden";
 
 export interface LoginPromptProps {
     onOpenChange: (open: boolean) => void;
@@ -181,6 +182,9 @@ export default function LoginPrompt(props: LoginPromptProps) {
             <DialogContent
                 className={`flex flex-col gap-4 ${!useEmailSignIn ? "p-0 pb-4 m-0 max-w-xl" : "w-fit"}`}
             >
+                <VisuallyHidden.Root>
+                    <DialogTitle>Login Dialog</DialogTitle>
+                </VisuallyHidden.Root>
                 <div>
                     {useEmailSignIn ? (
                         <EmailSignInContext
@@ -232,7 +236,7 @@ function EmailSignInContext({
     const [numFailures, setNumFailures] = useState(0);
 
     function checkOTPAndRedirect() {
-        const verifyUrl = `/auth/magic?code=${otp}&email=${email}`;
+        const verifyUrl = `/auth/magic?code=${encodeURIComponent(otp)}&email=${encodeURIComponent(email)}`;
 
         if (numFailures >= ALLOWED_OTP_ATTEMPTS) {
             setOTPError("Too many failed attempts. Please try again tomorrow.");