refactor: restructure waitlist form localization messages

- Updated English and Chinese localization files to nest waitlist form messages under a `form` object for better organization.
- Adjusted `WaitlistFormCard` component to utilize the new message structure, enhancing clarity and maintainability of the code.

messages/en.json

@@ -76,14 +76,16 @@
     "title": "Waitlist",
     "description": "Join our waitlist for latest news and updates",
     "subtitle": "Join our waitlist for latest news and updates",
-    "formTitle": "Join Our Waitlist",
-    "formDescription": "We will send you only one email every week, and no spam",
-    "email": "Email",
-    "emailValidation": "Please enter a valid email address",
-    "subscribe": "Subscribe",
-    "subscribing": "Subscribing...",
-    "success": "Subscribed successfully",
-    "fail": "Failed to subscribe"
+    "form": {
+      "title": "Join Our Waitlist",
+      "description": "We will send you only one email every week, and no spam",
+      "email": "Email",
+      "subscribe": "Subscribe",
+      "subscribing": "Subscribing...",
+      "success": "Subscribed successfully",
+      "fail": "Failed to subscribe",
+      "emailValidation": "Please enter a valid email address"
+    }
   },
   "AuthPage": {
     "login": {

messages/zh.json

@@ -70,14 +70,16 @@
     "title": "邮件列表",
     "description": "加入我们的邮件列表，获取最新消息和更新",
     "subtitle": "加入我们的邮件列表，获取最新消息和更新",
-    "formTitle": "加入我们的邮件列表",
-    "formDescription": "我们每周只发送一封邮件，并且不会发送垃圾邮件",
-    "email": "邮箱",
-    "emailValidation": "请输入有效的邮箱地址",
-    "subscribe": "订阅",
-    "subscribing": "订阅中...",
-    "success": "订阅成功",
-    "fail": "订阅失败"
+    "form": {
+      "title": "加入我们的邮件列表",
+      "description": "我们每周只发送一封邮件，并且不会发送垃圾邮件",
+      "email": "邮箱",
+      "subscribe": "订阅",
+      "subscribing": "订阅中...",
+      "success": "订阅成功",
+      "fail": "订阅失败",
+      "emailValidation": "请输入有效的邮箱地址"
+    }
   },
   "AuthPage": {
     "login": {

src/components/waitlist/waitlist-form-card.tsx

@@ -32,7 +32,7 @@ import { z } from 'zod';
  * This is a client component that handles the waitlist form submission
  */
 export function WaitlistFormCard() {
-  const t = useTranslations('WaitlistPage');
+  const t = useTranslations('WaitlistPage.form');
   const [isSubmitting, setIsSubmitting] = useState(false);
   const [error, setError] = useState<string | undefined>('');
 
@@ -81,10 +81,10 @@ export function WaitlistFormCard() {
     <Card className="mx-auto max-w-lg overflow-hidden">
       <CardHeader>
         <CardTitle className="text-lg font-bold">
-          {t('formTitle')}
+          {t('title')}
         </CardTitle>
         <CardDescription>
-          {t('formDescription')}
+          {t('description')}
         </CardDescription>
       </CardHeader>
       <Form {...form}>