fix: i18n 链接体系重构 + 五站差异化 toast 皮肤

语言切换/LOGO 同源 bug：手拼 /\${locale} 前缀在默认语言 en 下
产生空 href（<Link href=""> 点击无效、push('') 停留原地）或 /en/*（middleware 契约 404）。
- 新增 lib/locale-href.ts 统一拼接：剥已有语言段、重拼目标语言、根路径保证非空
- language-switcher：/zh 首页切回 en 的 push('') 修复（next-intl 路由
  的 {locale} 选项会强制加前缀 forcePrefix，与 as-needed 契约冲突，弃用）
- theme-header/footer/section：LOGO、View all、页脚链接走 localeHref；
  isActive 改用无前缀 pathname（en 下高亮失效修复）
- login/signup/email-verified-guard/social 回跳：消除 /en/* 404 死链
- ai-stack/findai 首页搜索表单 action 同修
- 新增 components/site-toaster.tsx：按 NEXT_PUBLIC_THEME_ID 切换
  位置/圆角/字体/图标/配色五套皮肤（蓝右下/橙顶中/纸感底中/终端左下/玻璃右上）
- 新增 ui-test-i18n-toast.mjs 回归脚本（16 项浏览器检查全通过）

packages/core/scripts/ui-test-i18n-toast.mjs

@@ -0,0 +1,166 @@
+/**
+ * # 脚本 ui-test-i18n-toast.mjs
+ * 说明：i18n 链接修复回归测试 + 各站差异化 toast 验证。
+ * 覆盖：en↔zh 互切（含 /zh 首页回 en 的历史 bug）、子路径切换、
+ *       LOGO 回首页（en/zh）、导航高亮、登录默认去向（含 redirect）、
+ *       5 站未登录投票触发 toast 并截图（/tmp/ui-test/toast-<site>.png）。
+ * 运行：bun packages/core/scripts/ui-test-i18n-toast.mjs
+ */
+import { chromium } from "playwright";
+
+const BASE = "https://ai-stack-bdev.opentest.cc";
+const SITES = [
+  ["ai-stack", "https://ai-stack-bdev.opentest.cc", "/tools/chatgpt"],
+  ["launchai", "https://launchai-bdev.opentest.cc", "/tools/perplexity"],
+  ["the-ai-ledger", "https://the-ai-ledger-bdev.opentest.cc", "/tools/midjourney"],
+  ["devai-tools", "https://devai-tools-bdev.opentest.cc", "/tools/github-copilot"],
+  ["findai", "https://findai-bdev.opentest.cc", "/tools/figma-ai"],
+];
+
+const browser = await chromium.launch({
+  executablePath: "/opt/brave.com/brave/brave",
+  args: ["--no-sandbox", "--disable-dev-shm-usage"],
+});
+const ctx = await browser.newContext({ viewport: { width: 1440, height: 900 } });
+const page = await ctx.newPage();
+page.setDefaultTimeout(30000);
+
+let pass = 0, fail = 0;
+async function step(name, fn) {
+  try {
+    await fn();
+    pass++;
+    console.log(`  ✓ ${name}`);
+  } catch (e) {
+    fail++;
+    console.log(`  ✗ ${name}: ${String(e).split("\n")[0].slice(0, 160)}`);
+    await page.screenshot({ path: `/tmp/ui-test/i18n-fail-${fail}.png` }).catch(() => {});
+  }
+}
+
+/* goto + 网络空闲（水合后才能点导航） */
+const gotoWait = async (url) => {
+  try {
+    await page.goto(url, { waitUntil: "domcontentloaded", timeout: 45000 });
+  } catch (e) {
+    if (!String(e).includes("ERR_NETWORK_CHANGED")) throw e;
+    await page.waitForTimeout(2000);
+    await page.goto(url, { waitUntil: "domcontentloaded", timeout: 45000 });
+  }
+  await page.waitForLoadState("networkidle", { timeout: 30000 }).catch(() => {});
+  await page.waitForTimeout(600);
+};
+
+/* 语言切换：等 get-session 解析 + 菜单出现 */
+async function switchTo(target) {
+  await page.request.get(`${new URL(page.url()).origin}/api/auth/get-session`).catch(() => {});
+  const btn = page.locator('button[aria-label="Select language"]');
+  await btn.click();
+  await page.getByRole("menuitem", { name: target }).click();
+  await page.waitForTimeout(1500);
+}
+
+const langBtn = () => page.locator('button[aria-label="Select language"]');
+const logoLink = () => page.locator("header a").filter({ has: page.locator('img[src="/icon.svg"]') }).first();
+
+console.log("== 1. 语言切换（ai-stack）==");
+await step("en 首页 → 切中文 → /zh", async () => {
+  await gotoWait(`${BASE}/`);
+  await switchTo("中文");
+  if (new URL(page.url()).pathname !== "/zh") throw new Error(`URL=${page.url()}`);
+});
+await step("/zh 首页 → 切回英文 → /（原 bug：停留原地）", async () => {
+  await switchTo("English");
+  if (new URL(page.url()).pathname !== "/") throw new Error(`URL=${page.url()}`);
+});
+await step("/zh/tools → 切英文 → /tools（子路径）", async () => {
+  await gotoWait(`${BASE}/zh/tools`);
+  await switchTo("English");
+  if (new URL(page.url()).pathname !== "/tools") throw new Error(`URL=${page.url()}`);
+});
+await step("/tools → 切中文 → /zh/tools（子路径反向）", async () => {
+  await switchTo("中文");
+  if (new URL(page.url()).pathname !== "/zh/tools") throw new Error(`URL=${page.url()}`);
+});
+
+console.log("== 2. LOGO 回首页 ==");
+await step("en：/tools 点 LOGO → /", async () => {
+  await gotoWait(`${BASE}/tools`);
+  await logoLink().click();
+  await page.waitForTimeout(1200);
+  if (new URL(page.url()).pathname !== "/") throw new Error(`URL=${page.url()}`);
+});
+await step("zh：/zh/tools 点 LOGO → /zh", async () => {
+  await gotoWait(`${BASE}/zh/tools`);
+  await logoLink().click();
+  await page.waitForTimeout(1200);
+  if (new URL(page.url()).pathname !== "/zh") throw new Error(`URL=${page.url()}`);
+});
+await step("en：/tools 导航项 Discover 有激活高亮", async () => {
+  await gotoWait(`${BASE}/tools`);
+  const active = await page
+    .locator('header nav a[href="/tools"]')
+    .first()
+    .evaluate((el) => el.className.includes("bg-secondary"));
+  if (!active) throw new Error("无激活样式");
+});
+
+console.log("== 3. 登录跳转 ==");
+await step("清理会话（API 登出）", async () => {
+  await page.request.post(`${BASE}/api/auth/sign-out`);
+  const session = await page.request.get(`${BASE}/api/auth/get-session`);
+  if ((JSON.parse(await session.text()) || {}).user) throw new Error("登出失败");
+});
+await step("en 带 redirect 登录 → /dashboard（原 bug：/en/ 404）", async () => {
+  await gotoWait(`${BASE}/login?redirect=%2Fdashboard`);
+  await page.getByLabel(/email/i).first().fill("alice@demo.dev");
+  await page.getByLabel(/password/i).first().fill("password123");
+  await page.getByRole("button", { name: /sign in/i }).first().click();
+  await page.waitForURL("**/dashboard", { timeout: 20000 });
+  if (new URL(page.url()).pathname !== "/dashboard") throw new Error(`URL=${page.url()}`);
+});
+await step("en 无 redirect 登录默认去当前语言首页 /（不再 /en/ 404）", async () => {
+  await page.request.post(`${BASE}/api/auth/sign-out`);
+  await gotoWait(`${BASE}/login`);
+  await page.getByLabel(/email/i).first().fill("alice@demo.dev");
+  await page.getByLabel(/password/i).first().fill("password123");
+  await page.getByRole("button", { name: /sign in/i }).first().click();
+  await page.waitForURL((u) => !u.pathname.includes("/login"), { timeout: 20000 });
+  if (new URL(page.url()).pathname !== "/") throw new Error(`URL=${page.url()}`);
+});
+await step("zh 带 redirect 登录 → /zh/dashboard", async () => {
+  await page.request.post(`${BASE}/api/auth/sign-out`);
+  await gotoWait(`${BASE}/zh/login?redirect=%2Fdashboard`);
+  await page.getByLabel(/邮箱|email/i).first().fill("alice@demo.dev");
+  await page.getByLabel(/密码|password/i).first().fill("password123");
+  // 精确匹配"登录"，避免误点"使用 GitHub 登录"
+  await page.getByRole("button", { name: "登录", exact: true }).first().click();
+  await page.waitForURL("**/zh/dashboard", { timeout: 20000 });
+  if (new URL(page.url()).pathname !== "/zh/dashboard") throw new Error(`URL=${page.url()}`);
+});
+
+console.log("== 4. 各站差异化 toast（未登录点 Upvote）==");
+await ctx.clearCookies();
+const _sess = await page.request.get(`${BASE}/api/auth/get-session`);
+if ((JSON.parse(await _sess.text()) || {}).user) throw new Error("清理 cookie 后仍有会话");
+for (const [site, base, tool] of SITES) {
+  await step(`${site}: toast 弹出且皮肤存在`, async () => {
+    await gotoWait(`${base}${tool}`);
+    const voteBtn = page.locator('button:has-text("Upvote"), button:has-text("Upvoted")').first();
+    await voteBtn.waitFor();
+    await voteBtn.click();
+    try {
+      await page.waitForSelector("[data-sonner-toast]", { timeout: 4000 });
+    } catch {
+      // 若已是已投状态，第一次点击是取消投票（无 toast），再点一次触发拦截提示
+      await voteBtn.click();
+      await page.waitForSelector("[data-sonner-toast]", { timeout: 10000 });
+    }
+    await page.waitForTimeout(600);
+    await page.screenshot({ path: `/tmp/ui-test/toast-${site}.png` });
+  });
+}
+
+console.log(`\n结果: ${pass} 通过 / ${fail} 失败`);
+await browser.close();
+process.exit(fail > 0 ? 1 : 0);

packages/core/src/components/language-switcher.tsx

@@ -1,39 +1,35 @@
 "use client";
 
 import { useLocale } from 'next-intl';
-import { useRouter, usePathname } from 'next/navigation';
+import { useRouter } from 'next/navigation';
-import { locales, localeNames, defaultLocale } from '@/i18n.config';
+import { usePathname } from '@/i18n/routing';
+import { locales, localeNames } from '@/i18n.config';
 import type { Locale } from '@/i18n.config';
 import { useState, useRef, useEffect } from 'react';
 import { ChevronDown, Globe, Check } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { localeHref } from '@/lib/locale-href';
 
 export function LanguageSwitcher() {
   const locale = useLocale();
   const router = useRouter();
+  // next-intl 的 usePathname 返回无语言前缀的路径（/zh/tools → /tools）
   const pathname = usePathname();
   const [isOpen, setIsOpen] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
-  // URL 即语言：默认语言（en）无前缀，其他语言带 /{locale}；去掉当前路径上的语言段后再拼目标前缀
+  // URL 即语言：用 localeHref 统一重拼目标语言链接（默认语言 en 无前缀、根路径
+  // 返回 '/' 而非空串）。不能用 next-intl 路由的 {locale} 选项——该实现只要
+  // 显式传 locale 就强制加前缀（forcePrefix），默认语言会得到 '/en/...'，
+  // 而 middleware 契约里 /en/* 是 404，这正是"zh 切不回 en"的根因。
   const switchLocale = (newLocale: Locale) => {
     if (newLocale === locale) {
       setIsOpen(false);
       return;
     }
 
-    let path = pathname;
+    const search = typeof window !== 'undefined' ? window.location.search : '';
-
+    router.push(`${localeHref(pathname, newLocale)}${search}`);
-    for (const loc of locales) {
-      if (pathname === `/${loc}` || pathname.startsWith(`/${loc}/`)) {
-        path = pathname.slice(loc.length + 1) || '/';
-        break;
-      }
-    }
-
-    const normalizedPath = path === '/' ? '' : path;
-    const prefix = newLocale === defaultLocale ? '' : `/${newLocale}`;
-    router.push(`${prefix}${normalizedPath}`);
     setIsOpen(false);
   };
 

packages/core/src/components/site-toaster.tsx

@@ -0,0 +1,138 @@
+"use client";
+
+import { Toaster } from "sonner";
+import type { ToasterProps } from "sonner";
+import {
+  Layers,
+  Rocket,
+  BookOpen,
+  Terminal,
+  Search,
+  CircleX,
+  TriangleAlert,
+  Info,
+} from "lucide-react";
+import { cn } from "@/lib/utils";
+
+/**
+ * # 组件 SiteToaster
+ * 说明：按站点主题（NEXT_PUBLIC_THEME_ID，构建期内联）切换 toast 皮肤——
+ *      位置、圆角、字体、配色、图标全部差异化，替代五站同款的
+ *      shadcn/sonner 默认样式。各站皮肤：
+ *      - ai-stack     专业蓝：右下角、圆角卡片 + 品牌蓝左侧竖条、层叠图标
+ *      - launchai     活力橙：顶部居中、橙色渐变胶囊（白字）、火箭图标
+ *      - the-ai-ledger 编辑纸感：底部居中、直角米色纸面 + 硬投影 + 衬线字
+ *      - devai-tools  终端绿：左下角、深色终端底 + 等宽字、终端图标
+ *      - findai       玻璃紫：右上角、毛玻璃圆角卡 + 紫色描边、放大镜图标
+ */
+interface SiteSkin {
+  /** 位置（五站互不相同，避免互相雷同） */
+  position: ToasterProps["position"];
+  /** 距视口偏移（顶部皮肤需避开 sticky header 与导航进度条） */
+  offset?: number | string;
+  /** 应用到每条 toast 的 class（! 前缀覆盖 sonner 默认底色/文字色） */
+  toastClass: string;
+  /** 应用到每条 toast 的内联样式（字体等 Tailwind 不便表达的项） */
+  toastStyle?: React.CSSProperties;
+  /** 各类型 toast 的自定义图标 */
+  icons: ToasterProps["icons"];
+}
+
+const SKINS: Record<string, SiteSkin> = {
+  "ai-stack": {
+    position: "bottom-right",
+    toastClass: cn(
+      "!rounded-xl !border-blue-600/25 !bg-white !text-slate-800",
+      "!shadow-lg !shadow-blue-950/10 dark:!bg-zinc-900 dark:!text-zinc-100",
+      "dark:!border-blue-400/25"
+    ),
+    toastStyle: { borderLeft: "3px solid #2563eb" },
+    icons: {
+      success: <Layers className="h-4 w-4 text-blue-600 dark:text-blue-400" />,
+      error: <CircleX className="h-4 w-4 text-red-500" />,
+      warning: <TriangleAlert className="h-4 w-4 text-amber-500" />,
+      info: <Info className="h-4 w-4 text-blue-500" />,
+    },
+  },
+  launchai: {
+    position: "top-center",
+    offset: 68,
+    toastClass: cn(
+      "!rounded-full !border-0 !bg-gradient-to-r !from-orange-500 !to-amber-500",
+      "!text-white !shadow-lg !shadow-orange-500/30"
+    ),
+    toastStyle: { fontWeight: 600 },
+    icons: {
+      success: <Rocket className="h-4 w-4 text-white" />,
+      error: <CircleX className="h-4 w-4 text-white" />,
+      warning: <TriangleAlert className="h-4 w-4 text-white" />,
+      info: <Info className="h-4 w-4 text-white" />,
+    },
+  },
+  "the-ai-ledger": {
+    position: "bottom-center",
+    toastClass: cn(
+      "!rounded-none !border !border-[#26221f] !bg-[#fbf7f0] !text-[#26221f]",
+      "!shadow-[4px_4px_0_#26221f]"
+    ),
+    toastStyle: {
+      fontFamily: "Georgia, 'Times New Roman', serif",
+    },
+    icons: {
+      success: <BookOpen className="h-4 w-4 text-amber-800" />,
+      error: <CircleX className="h-4 w-4 text-red-800" />,
+      warning: <TriangleAlert className="h-4 w-4 text-amber-700" />,
+      info: <Info className="h-4 w-4 text-amber-800" />,
+    },
+  },
+  "devai-tools": {
+    position: "bottom-left",
+    toastClass: cn(
+      "!rounded-md !border !border-emerald-500/40 !bg-[#0d1117] !text-emerald-300",
+      "!shadow-lg !shadow-emerald-950/40",
+      "[&_\\[data-description\\]]:!text-emerald-400/80"
+    ),
+    toastStyle: {
+      fontFamily: "ui-monospace, SFMono-Regular, Menlo, monospace",
+      fontSize: "0.85rem",
+    },
+    icons: {
+      success: <Terminal className="h-4 w-4 text-emerald-400" />,
+      error: <CircleX className="h-4 w-4 text-red-400" />,
+      warning: <TriangleAlert className="h-4 w-4 text-yellow-400" />,
+      info: <Info className="h-4 w-4 text-sky-400" />,
+    },
+  },
+  findai: {
+    position: "top-right",
+    offset: 64,
+    toastClass: cn(
+      "!rounded-2xl !border-violet-500/30 !bg-white/75 !text-zinc-800",
+      "!shadow-xl !shadow-violet-500/10 !backdrop-blur-xl",
+      "dark:!bg-zinc-900/75 dark:!text-zinc-100 dark:!border-violet-400/30"
+    ),
+    toastStyle: { boxShadow: "inset 0 0 0 1px rgba(124,58,237,0.12)" },
+    icons: {
+      success: <Search className="h-4 w-4 text-violet-600 dark:text-violet-400" />,
+      error: <CircleX className="h-4 w-4 text-red-500" />,
+      warning: <TriangleAlert className="h-4 w-4 text-amber-500" />,
+      info: <Info className="h-4 w-4 text-violet-500" />,
+    },
+  },
+};
+
+export function SiteToaster() {
+  // NEXT_PUBLIC_* 在构建期内联进客户端包，每站构建各得其所
+  const skin = SKINS[process.env.NEXT_PUBLIC_THEME_ID || "ai-stack"] ?? SKINS["ai-stack"];
+  return (
+    <Toaster
+      position={skin.position}
+      offset={skin.offset}
+      toastOptions={{
+        classNames: { toast: skin.toastClass },
+        style: skin.toastStyle,
+      }}
+      icons={skin.icons}
+    />
+  );
+}

packages/core/src/features/auth/components/email-verified-guard.tsx

@@ -2,6 +2,7 @@
 
 import * as React from "react";
 import { useRouter as useIntlRouter } from "@/i18n/routing";
+import { localeHref } from "@/lib/locale-href";
 import { useLocale, useTranslations } from 'next-intl';
 import { Mail, AlertCircle } from 'lucide-react';
 import { useSession } from "@/lib/auth-client";
@@ -121,7 +122,7 @@ export function EmailVerifiedGuard({
                 <button
                   onClick={() => {
                     // Sign out and redirect to login
-                    window.location.href = `/${locale}/login`;
+                    window.location.href = localeHref("/login", locale);
                   }}
                   className="text-sm text-muted-foreground hover:text-foreground"
                 >

packages/core/src/features/auth/components/login-form.tsx

@@ -3,6 +3,7 @@
 import * as React from "react";
 import { useRouter } from "next/navigation";
 import { LocaleLink } from "@/components/locale-link";
+import { localeHref } from "@/lib/locale-href";
 import { useLocale, useTranslations } from 'next-intl';
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useForm } from "react-hook-form";
@@ -49,7 +50,8 @@ export function LoginForm() {
         typeof window !== "undefined"
           ? new URLSearchParams(window.location.search).get("redirect")
           : null;
-      router.push(redirect || `/${locale}/`);
+      // localeHref 剥离 redirect 上可能带的语言段并按目标语言重拼，en 根路径返回 "/" 而非空串
+      router.push(localeHref(redirect || "/", locale));
     } catch (err) {
       setError(t('errors.loginFailed'));
     } finally {

packages/core/src/features/auth/components/signup-form.tsx

@@ -4,6 +4,7 @@ import * as React from "react";
 import { useRouter } from "next/navigation";
 import { LocaleLink } from "@/components/locale-link";
 import { useLocale, useTranslations } from 'next-intl';
+import { localeHref } from '@/lib/locale-href';
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useForm } from "react-hook-form";
 
@@ -60,13 +61,13 @@ export function SignupForm() {
 
       // 开发模式（默认）注册即已验证 → 直接回跳原页面/首页；生产跳验证提示页
       if (process.env.NEXT_PUBLIC_DEV_SKIP_EMAIL_VERIFY === "false") {
-        router.push(`/check-email`);
+        router.push(localeHref('/check-email', locale));
       } else {
         const redirect =
           typeof window !== "undefined"
             ? new URLSearchParams(window.location.search).get("redirect")
             : null;
-        router.push(redirect || `/${locale}/`);
+        router.push(localeHref(redirect || '/', locale));
       }
     } catch (err) {
       setError(t('errors.signupFailed'));

packages/core/src/features/auth/components/social-auth-buttons.tsx

@@ -3,6 +3,7 @@
 import { useState } from "react";
 import { useRouter } from "next/navigation";
 import { useLocale, useTranslations } from "next-intl";
+import { localeHref } from "@/lib/locale-href";
 import { IconBrandGoogle, IconBrandGithub } from "@tabler/icons-react";
 
 interface SocialAuthButtonsProps {
@@ -51,7 +52,7 @@ export function SocialAuthButtons({
       if (!res.ok) throw new Error("mock failed");
       // session 已建立，回跳原页面
       const target = getCallbackURL();
-      window.location.assign(`/${locale}${target === "/" ? "" : target}`);
+      window.location.assign(localeHref(target, locale));
     } catch {
       setMockLoading(null);
       setMockError(true);

packages/core/src/kit/section.tsx

@@ -1,12 +1,6 @@
 import { Link } from "next-view-transitions";
 import { useLocale } from "next-intl";
-import { defaultLocale } from "@/i18n.config";
+import { localeHref } from "@/lib/locale-href";
-
-/** 站内链接的确定性 locale 前缀 */
-function localizedHref(href: string, locale: string): string {
-  const prefix = locale === defaultLocale ? "" : `/${locale}`;
-  return `${prefix}${href === "/" ? "" : href}`;
-}
 import { ArrowRight } from "lucide-react";
 
 /**
@@ -39,7 +33,7 @@ export function SectionHeader({
       </div>
       {viewAllHref && (
         <Link
-          href={localizedHref(viewAllHref, locale)}
+          href={localeHref(viewAllHref, locale)}
           className="inline-flex shrink-0 items-center gap-1 text-xs font-medium text-muted-foreground transition-colors hover:text-primary"
         >
           {viewAllLabel}

packages/core/src/kit/theme-footer.tsx

@@ -2,13 +2,7 @@
 
 import { Link } from "next-view-transitions";
 import { useLocale } from "next-intl";
-import { defaultLocale } from "@/i18n.config";
+import { localeHref } from "@/lib/locale-href";
-
-/** 站内链接的确定性 locale 前缀 */
-function localizedHref(href: string, locale: string): string {
-  const prefix = locale === defaultLocale ? "" : `/${locale}`;
-  return `${prefix}${href === "/" ? "" : href}`;
-}
 
 import { NewsletterForm } from "@/features/marketing/components/newsletter-form";
 import type { ThemeBrand } from "./types";
@@ -30,7 +24,7 @@ export function ThemeFooter({ brand, groups }: ThemeFooterProps) {
       <div className="site-container px-4 py-12 sm:px-6">
         <div className="grid gap-10 md:grid-cols-4">
           <div className="md:col-span-1">
-            <Link href={localizedHref("/", locale)} className="flex items-center gap-2">
+            <Link href={localeHref("/", locale)} className="flex items-center gap-2">
               <span className="flex h-7 w-7 items-center justify-center rounded-lg bg-primary font-bold text-primary-foreground">
                 {brand.name.slice(0, 1)}
               </span>
@@ -52,7 +46,7 @@ export function ThemeFooter({ brand, groups }: ThemeFooterProps) {
                 {group.links.map((link) => (
                   <li key={link.href + link.label}>
                     <Link
-                      href={localizedHref(link.href, locale)}
+                      href={localeHref(link.href, locale)}
                       className="text-[0.85rem] text-muted-foreground transition-colors hover:text-foreground"
                     >
                       {link.label}

packages/core/src/kit/theme-header.tsx

@@ -6,16 +6,9 @@ import { Link } from "next-view-transitions";
 import { ModeToggle } from "@/components/mode-toggle";
 import { LanguageSwitcher } from "@/components/language-switcher";
 import { UserMenu } from "@/features/navigation/components/user-menu";
-import { usePathname } from "next/navigation";
+import { usePathname } from "@/i18n/routing";
 import { useRouter as useIntlRouter } from "@/i18n/routing";
-import { locales, defaultLocale, type Locale } from "@/i18n.config";
+import { localeHref } from "@/lib/locale-href";
-
-/** 站内链接的确定性 locale 前缀：默认语言无前缀，其他语言带 /{locale} */
-function localizedHref(href: string, locale: string): string {
-  const prefix = locale === defaultLocale ? "" : `/${locale}`;
-  const normalized = href === "/" ? "" : href;
-  return `${prefix}${normalized}`;
-}
 import { useLocale } from "next-intl";
 import { cn } from "@/lib/utils";
 import type { ThemeBrand } from "./types";
@@ -57,9 +50,11 @@ export function ThemeHeader({
     router.push(`/tools?search=${encodeURIComponent(query.trim())}`);
   };
 
+  // pathname 来自 next-intl 路由（无语言前缀），直接与站内 href 比较；
+  // 原实现拼 `/${locale}${href}` 在 en 下得到 /en/tools，与真实路径永不相等
   const isActive = (href: string) => {
-    const full = `/${locale}${href === "/" ? "" : href}`;
+    if (href === "/") return pathname === "/";
-    return pathname === full || (href !== "/" && pathname.startsWith(full));
+    return pathname === href || pathname.startsWith(`${href}/`);
   };
 
   return (
@@ -71,7 +66,7 @@ export function ThemeHeader({
     >
       <div className="site-container flex h-14 items-center justify-between gap-2 px-4 sm:px-6">
         {/* Logo */}
-        <Link href={localizedHref("/", locale)} className="flex shrink-0 items-center gap-2 whitespace-nowrap">
+        <Link href={localeHref("/", locale)} className="flex shrink-0 items-center gap-2 whitespace-nowrap">
           {/* 站点 logo（codex 生成的 icon.svg，自带品牌色底，深浅通吃） */}
           {/* eslint-disable-next-line @next/next/no-img-element */}
           <img src="/icon.svg" alt="" className="h-7 w-7 rounded-lg" width={28} height={28} />
@@ -85,7 +80,7 @@ export function ThemeHeader({
           {navItems.map((item) => (
             <Link
               key={item.href}
-              href={localizedHref(item.href, locale)}
+              href={localeHref(item.href, locale)}
               className={cn(
                 "whitespace-nowrap rounded-lg px-2 py-1.5 text-[0.95rem] transition-colors",
                 isActive(item.href)
@@ -140,7 +135,7 @@ export function ThemeHeader({
           {navItems.map((item) => (
             <Link
               key={item.href}
-              href={localizedHref(item.href, locale)}
+              href={localeHref(item.href, locale)}
               className={cn(
                 "block rounded-lg px-3 py-2.5 text-[0.95rem]",
                 isActive(item.href)

packages/core/src/lib/locale-href.ts

@@ -0,0 +1,20 @@
+import { defaultLocale, locales } from '@/i18n.config';
+
+/**
+ * # 函数 localeHref
+ * 说明：与 middleware localePrefix: 'as-needed' 一致的站内链接拼接：
+ *      - 默认语言（en）不带前缀，其他语言带 /{locale}；
+ *      - 先剥离 href 上已有的语言段（/en、/zh），避免叠加出 /zh/en/... 之类死链；
+ *      - 保证返回值非空：根路径在默认语言下返回 '/'——手拼 `/${locale}` 时
+ *        en 根路径会得到空串（<Link href=""> 点击无效、router.push('') 停留原地）
+ *        或 '/en/...'（该前缀在本配置下 404），站内所有拼接必须统一走这里。
+ * 参数：href 站内路径（可带语言段/查询串）；locale 目标语言
+ * 返回：可直接用于 Link/router/window.location 的路径
+ */
+export function localeHref(href: string, locale: string): string {
+  const prefix = locale === defaultLocale ? '' : `/${locale}`;
+  const cleaned = href.replace(new RegExp(`^/(${locales.join('|')})(?=/|$)`), '');
+  if (cleaned === '' || cleaned === '/') return prefix || '/';
+  const normalized = cleaned.startsWith('/') ? cleaned : `/${cleaned}`;
+  return `${prefix}${normalized}`;
+}

packages/core/src/pages/[locale]/layout.tsx

@@ -8,7 +8,7 @@ import { GeistSans } from "geist/font/sans";
 import { cn } from "@/lib/utils";
 import { ViewTransitions } from "next-view-transitions";
 import { ThemeProvider } from "@/context/theme-provider";
-import { Toaster } from "sonner";
+import { SiteToaster } from "@/components/site-toaster";
 import Analytics from "@/analytics/analytics";
 import { NavigationProgress } from "@/components/navigation-progress";
 
@@ -79,7 +79,7 @@ export default async function LocaleLayout({
                 <NavigationProgress />
               </Suspense>
               {children}
-              <Toaster position="top-right" richColors />
+              <SiteToaster />
               <Analytics />
             </NextIntlClientProvider>
           </ThemeProvider>

sites/ai-stack/src/site/home.tsx

@@ -5,6 +5,7 @@ import { getTranslations } from "next-intl/server";
 import { ToolCard, ToolCardGrid } from "@/components/tool-card";
 import { LocaleLink } from "@/components/locale-link";
 import { SectionHeader } from "@/kit/section";
+import { localeHref } from "@/lib/locale-href";
 import { ThemeHeader } from "@/kit/theme-header";
 import { ThemeFooter } from "@/kit/theme-footer";
 import { getHomeDataSafe } from "@/kit/home-data";
@@ -66,7 +67,7 @@ async function SiteHome({ locale }: { locale: string }) {
           <p className="mx-auto mt-4 max-w-2xl text-sm leading-relaxed text-muted-foreground sm:text-base">
             {th("description")}
           </p>
-          <form action={`/${locale}/tools`} className="mx-auto mt-8 max-w-xl">
+          <form action={localeHref("/tools", locale)} className="mx-auto mt-8 max-w-xl">
             <div className="relative">
               <Search className="absolute left-4 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
               <input

sites/findai/src/site/home.tsx

@@ -5,6 +5,7 @@ import { getTranslations } from "next-intl/server";
 import { ToolCardGrid } from "@/components/tool-card";
 import { LocaleLink } from "@/components/locale-link";
 import { getHomeDataSafe } from "@/kit/home-data";
+import { localeHref } from "@/lib/locale-href";
 
 async function SiteHome({ locale }: { locale: string }) {
   const t = await getTranslations("siteHome");
@@ -31,7 +32,7 @@ async function SiteHome({ locale }: { locale: string }) {
           {siteConfig.brand.tagline.replace(/\.$/, "")}
         </p>
 
-        <form action={`/${locale}/tools`} className="mt-10 w-full max-w-xl">
+        <form action={localeHref("/tools", locale)} className="mt-10 w-full max-w-xl">
           <div className="relative">
             <Search className="absolute left-5 top-1/2 h-5 w-5 -translate-y-1/2 text-muted-foreground" />
             <input