Login: 6-digit OTP + desktop layout

- OTP input now 6 digits (matches backend 6-digit codes): maxLength 6, six
  slots with responsive widths, verify enabled at length === 6
- login page: centered desktop card on a neutral canvas with brand mark
- MyLayout: auth pages (/login, /logout) get full-width desktop canvas and no
  mobile bottom nav at lg (no shopping header/footer)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/components/MyLayout.tsx

@@ -36,6 +36,10 @@ const MyLayout = React.memo(({ children }: { children: React.ReactNode }) => {
     p.startsWith("/search/") ||
     p.startsWith("/seller/") ||
     p === "/cart";
+  // Auth pages get a full-width desktop canvas (so they can center their own
+  // card) but no shopping header/footer.
+  const isAuth = p === "/login" || p === "/logout";
+  const expandOnDesktop = isDesktopReady || isAuth;
   const isThread = !!location.pathname.split("threads")[1];
 
   return (
@@ -43,18 +47,22 @@ const MyLayout = React.memo(({ children }: { children: React.ReactNode }) => {
       {isDesktopReady && <DesktopHeader />}
       <div
         className={`max-w-md mx-auto bg-WHITE min-h-screen shadow-lg lg:shadow-xl ${
-          isDesktopReady
+          expandOnDesktop
             ? "lg:max-w-none lg:mx-0 lg:min-h-0 lg:shadow-none"
             : ""
         }`}
       >
         <div
           className={`pb-[calc(50px+env(safe-area-inset-bottom))] ${
-            isDesktopReady ? "lg:pb-0" : ""
+            expandOnDesktop ? "lg:pb-0" : ""
           }`}
         >
           {children}
-          {isThread ? <></> : <MobileBottomNavigation hideOnDesktop={isDesktopReady} />}
+          {isThread ? (
+            <></>
+          ) : (
+            <MobileBottomNavigation hideOnDesktop={expandOnDesktop} />
+          )}
         </div>
       </div>
       {isDesktopReady && <DesktopFooter />}

app/routes/login.tsx

@@ -21,6 +21,7 @@ import AppInput from "~/components/AppInput";
 import { useToast } from "~/hooks/use-toast";
 import { useSubmit, useLoaderData } from "@remix-run/react";
 import { User } from "~/utils/token-manager.server";
+import logo from "~/assets/logo/SVG-07.svg";
 
 // Only allow same-site, path-relative redirects. Rejects absolute URLs
 // (https://evil.com) and protocol-relative URLs (//evil.com) to prevent
@@ -106,8 +107,14 @@ export default function LoginPage() {
   };
 
   return (
-    <div className="flex flex-col gap-6 px-[20px] py-12 items-center w-full">
-      {enableVerifySection ? (
+    <div className="lg:min-h-screen lg:flex lg:items-center lg:justify-center lg:bg-WHITE2 lg:py-12">
+      <div className="flex flex-col gap-6 px-[20px] py-12 items-center w-full lg:max-w-[460px] lg:bg-WHITE lg:rounded-2xl lg:border lg:border-WHITE3 lg:shadow-lg lg:px-8 lg:py-10 lg:my-12">
+        {/* Brand (desktop) */}
+        <div className="hidden lg:flex items-center gap-2.5 mb-1">
+          <img src={logo} alt="ویترون" className="w-7 h-9 object-contain" />
+          <b className="text-[22px] font-extrabold text-VITROWN_BLUE">ویترون</b>
+        </div>
+        {enableVerifySection ? (
         <>
           <div className="flex flex-col gap-4 w-full items-center">
             <img alt="" src={verifyBanner} className="w-[85px] h-[70px]" />
@@ -127,7 +134,7 @@ export default function LoginPage() {
           </div>
           <div className="w-full mt-2 flex justify-center">
             <InputOTP
-              maxLength={4}
+              maxLength={6}
               onComplete={(finalValue) => {
                 const convertedValue = convertPersianToEnglish(finalValue);
                 setOtpValue(convertedValue);
@@ -138,17 +145,19 @@ export default function LoginPage() {
                 setOtpValue(convertedValue);
               }}
             >
-              <InputOTPGroup dir="ltr" className="gap-4">
-                <InputOTPSlot index={0} />
-                <InputOTPSlot index={1} />
-                <InputOTPSlot index={2} />
-                <InputOTPSlot index={3} />
+              <InputOTPGroup dir="ltr" className="gap-1.5 sm:gap-3">
+                <InputOTPSlot index={0} className="!w-9 sm:!w-12" />
+                <InputOTPSlot index={1} className="!w-9 sm:!w-12" />
+                <InputOTPSlot index={2} className="!w-9 sm:!w-12" />
+                <InputOTPSlot index={3} className="!w-9 sm:!w-12" />
+                <InputOTPSlot index={4} className="!w-9 sm:!w-12" />
+                <InputOTPSlot index={5} className="!w-9 sm:!w-12" />
               </InputOTPGroup>
             </InputOTP>
           </div>
           <div className="gap-4 w-full flex flex-col items-center">
             <Button
-              disabled={verifyOtpMutation.isPending || !(otpValue.length === 4)}
+              disabled={verifyOtpMutation.isPending || !(otpValue.length === 6)}
               className="w-[90%]"
               size={"xl"}
               variant="dark"
@@ -235,6 +244,7 @@ export default function LoginPage() {
           </Button>
         </>
       )}
+      </div>
     </div>
   );
 }