chore: remove About link from header and language switcher from about pages

- Remove About link and sponsor notice icon from chat panel header
- Remove language switcher (English | 中文 | 日本語) from all about pages
- Fix About link in settings dialog to use current language
- Remove unused sponsorTooltip translation key from all dictionaries

app/[lang]/about/cn/page.tsx

@@ -72,28 +72,6 @@ export default function AboutCN() {
                         <p className="text-xl text-gray-600 font-medium">
                             AI驱动的图表创建工具 - 对话、绘制、可视化
                         </p>
-                        <div className="flex justify-center gap-4 mt-4 text-sm">
-                            <Link
-                                href="/about"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                English
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/cn"
-                                className="text-blue-600 font-semibold"
-                            >
-                                中文
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/ja"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                日本語
-                            </Link>
-                        </div>
                     </div>
 
                     <div className="relative mb-8 rounded-2xl bg-gradient-to-br from-amber-50 via-orange-50 to-yellow-50 p-[1px] shadow-lg">

app/[lang]/about/ja/page.tsx

@@ -80,28 +80,6 @@ export default function AboutJA() {
                             AI搭載のダイアグラム作成ツール -
                             チャット、描画、可視化
                         </p>
-                        <div className="flex justify-center gap-4 mt-4 text-sm">
-                            <Link
-                                href="/about"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                English
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/cn"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                中文
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/ja"
-                                className="text-blue-600 font-semibold"
-                            >
-                                日本語
-                            </Link>
-                        </div>
                     </div>
 
                     <div className="relative mb-8 rounded-2xl bg-gradient-to-br from-amber-50 via-orange-50 to-yellow-50 p-[1px] shadow-lg">

app/[lang]/about/page.tsx

@@ -80,28 +80,6 @@ export default function About() {
                             AI-Powered Diagram Creation Tool - Chat, Draw,
                             Visualize
                         </p>
-                        <div className="flex justify-center gap-4 mt-4 text-sm">
-                            <Link
-                                href="/about"
-                                className="text-blue-600 font-semibold"
-                            >
-                                English
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/cn"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                中文
-                            </Link>
-                            <span className="text-gray-400">|</span>
-                            <Link
-                                href="/about/ja"
-                                className="text-gray-600 hover:text-blue-600"
-                            >
-                                日本語
-                            </Link>
-                        </div>
                     </div>
 
                     <div className="relative mb-8 rounded-2xl bg-gradient-to-br from-amber-50 via-orange-50 to-yellow-50 p-[1px] shadow-lg">

components/chat-panel.tsx

@@ -3,14 +3,12 @@
 import { useChat } from "@ai-sdk/react"
 import { DefaultChatTransport } from "ai"
 import {
-    AlertTriangle,
     MessageSquarePlus,
     PanelRightClose,
     PanelRightOpen,
     Settings,
 } from "lucide-react"
 import Image from "next/image"
-import Link from "next/link"
 import type React from "react"
 import { useCallback, useEffect, useRef, useState } from "react"
 import { flushSync } from "react-dom"
@@ -952,32 +950,6 @@ export default function ChatPanel({
                                 Next AI Drawio
                             </h1>
                         </div>
-                        {!isMobile && (
-                            <Link
-                                href="/about"
-                                target="_blank"
-                                rel="noopener noreferrer"
-                                className="text-sm text-muted-foreground hover:text-foreground transition-colors ml-2"
-                            >
-                                {dict.nav.about}
-                            </Link>
-                        )}
-                        {!isMobile && (
-                            <Link
-                                href="/about"
-                                target="_blank"
-                                rel="noopener noreferrer"
-                            >
-                                <ButtonWithTooltip
-                                    tooltipContent={dict.nav.sponsorTooltip}
-                                    variant="ghost"
-                                    size="icon"
-                                    className="h-6 w-6 text-amber-500 hover:text-amber-600"
-                                >
-                                    <AlertTriangle className="h-4 w-4" />
-                                </ButtonWithTooltip>
-                            </Link>
-                        )}
                     </div>
                     <div className="flex items-center gap-1 justify-end overflow-visible">
                         <ButtonWithTooltip

components/settings-dialog.tsx

@@ -395,13 +395,13 @@ function SettingsContent({
                         <>
                             <span className="text-muted-foreground">·</span>
                             <a
-                                href="/about"
+                                href={`/${currentLang}/about${currentLang === "zh" ? "/cn" : currentLang === "ja" ? "/ja" : ""}`}
                                 target="_blank"
                                 rel="noopener noreferrer"
                                 className="text-xs text-muted-foreground hover:text-foreground transition-colors flex items-center gap-1"
                             >
                                 <Info className="h-3 w-3" />
-                                About
+                                {dict.nav.about}
                             </a>
                         </>
                     )}

lib/i18n/dictionaries/en.json

@@ -18,8 +18,7 @@
         "settings": "Settings",
         "hidePanel": "Hide chat panel (Ctrl+B)",
         "showPanel": "Show chat panel (Ctrl+B)",
-        "aiChat": "AI Chat",
+        "aiChat": "AI Chat"
-        "sponsorTooltip": "Sponsored by ByteDance Doubao K2-thinking. See About page for details."
     },
     "providers": {
         "useServerDefault": "Use Server Default",

lib/i18n/dictionaries/ja.json

@@ -18,8 +18,7 @@
         "settings": "設定",
         "hidePanel": "チャットパネルを非表示 (Ctrl+B)",
         "showPanel": "チャットパネルを表示 (Ctrl+B)",
-        "aiChat": "AI チャット",
+        "aiChat": "AI チャット"
-        "sponsorTooltip": "ByteDance Doubao K2-thinking によるスポンサー。詳細は概要ページをご覧ください。"
     },
     "providers": {
         "useServerDefault": "サーバーデフォルトを使用",

lib/i18n/dictionaries/zh.json

@@ -18,8 +18,7 @@
         "settings": "设置",
         "hidePanel": "隐藏聊天面板 (Ctrl+B)",
         "showPanel": "显示聊天面板 (Ctrl+B)",
-        "aiChat": "AI 聊天",
+        "aiChat": "AI 聊天"
-        "sponsorTooltip": "由字节跳动豆包 K2-thinking 赞助。详情请参阅关于页面。"
     },
     "providers": {
         "useServerDefault": "使用服务器默认值",