feat(auth): 优化登录注册页面与人机验证展示

- 调整登录、注册页布局为更一致的卡片式结构，提升表单可读性与视觉层级。
- 为登录/注册按钮与状态区补充图标和文案，优化交互反馈。
- 让 Turnstile 验证组件支持自适应宽度并使用更合适的展示尺寸。

apps/web/src/pages/login.tsx

@@ -1,6 +1,7 @@
 import * as React from "react"
 import { Link, Navigate } from "react-router-dom"
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query"
+import { ArrowRight, KeyRound, LockKeyhole } from "lucide-react"
 import { api } from "@/lib/api"
 import { useMe } from "@/hooks/use-me"
 import { TurnstileBox } from "@/components/turnstile-box"
@@ -34,42 +35,52 @@ export function LoginPage() {
   const turnstileRequired = !!publicSettings.data?.turnstileEnabled
   if (me.data?.user) return <Navigate to="/" replace />
   return (
-    <div className="grid min-h-screen place-items-center bg-background px-4">
-      <div className="w-full max-w-[360px]">
-        <div className="mb-10 text-center">
-          <h1 className="text-3xl font-bold tracking-tight">LanQin Email</h1>
+    <div className="flex min-h-screen items-center justify-center bg-muted/20 px-4 py-10">
+      <div className="w-full max-w-[420px]">
+        <div className="mb-7 text-center">
+          <h1 className="text-3xl font-semibold tracking-tight">LanQin Email</h1>
         </div>
-        <form className="space-y-5" onSubmit={(e) => { e.preventDefault(); if (!challengeToken && turnstileRequired && !turnstileToken) { toast({ title: "请先完成人机验证" }); return }; login.mutate(new FormData(e.currentTarget)) }}>
-          {!challengeToken ? (
-            <>
+        <div className="rounded-lg border bg-background p-6 shadow-sm sm:p-7">
+          <div className="mb-6 flex items-center gap-2 text-sm font-medium text-muted-foreground">
+            {challengeToken ? <KeyRound className="h-4 w-4" /> : <LockKeyhole className="h-4 w-4" />}
+            {challengeToken ? "双因素验证" : "账号登录"}
+          </div>
+          <form className="space-y-5" onSubmit={(e) => { e.preventDefault(); if (!challengeToken && turnstileRequired && !turnstileToken) { toast({ title: "请先完成人机验证" }); return }; login.mutate(new FormData(e.currentTarget)) }}>
+            {!challengeToken ? (
+              <>
+                <div className="space-y-2">
+                  <Label htmlFor="email" className="text-sm font-medium">邮箱</Label>
+                  <Input id="email" name="email" type="email" autoComplete="username" required className="h-11 text-base" />
+                </div>
+                <div className="space-y-2">
+                  <Label htmlFor="password" className="text-sm font-medium">密码</Label>
+                  <PasswordInput id="password" name="password" autoComplete="current-password" required className="h-11 text-base" />
+                </div>
+              </>
+            ) : (
               <div className="space-y-2">
-                <Label htmlFor="email">邮箱</Label>
-                <Input id="email" name="email" type="email" autoComplete="username" required className="h-11 text-base" />
+                <Label htmlFor="twoFactorCode" className="text-sm font-medium">双因素验证码</Label>
+                <Input id="twoFactorCode" name="twoFactorCode" inputMode="numeric" autoComplete="one-time-code" minLength={6} maxLength={6} required className="h-11 text-center text-lg tracking-[0.35em]" />
               </div>
-              <div className="space-y-2">
-                <Label htmlFor="password">密码</Label>
-                <PasswordInput id="password" name="password" autoComplete="current-password" required className="h-11 text-base" />
-              </div>
-            </>
-          ) : (
-            <div className="space-y-2">
-              <Label htmlFor="twoFactorCode">双因素验证码</Label>
-              <Input id="twoFactorCode" name="twoFactorCode" inputMode="numeric" autoComplete="one-time-code" minLength={6} maxLength={6} required className="h-11 text-base" />
-            </div>
-          )}
-          {!challengeToken && turnstileRequired && (
-            <TurnstileBox siteKey={publicSettings.data?.turnstileSiteKey || ""} onToken={setTurnstileToken} />
-          )}
-          <Button className="h-11 w-full text-base" disabled={login.isPending}>
-            {login.isPending ? "登录中..." : challengeToken ? "验证登录" : "登录"}
-          </Button>
-          {challengeToken && <Button type="button" variant="ghost" className="w-full" onClick={() => setChallengeToken("")}>返回登录</Button>}
-          {!challengeToken && (
-            <Button type="button" variant="ghost" className="w-full" asChild>
+            )}
+            {!challengeToken && turnstileRequired && (
+              <TurnstileBox siteKey={publicSettings.data?.turnstileSiteKey || ""} onToken={setTurnstileToken} />
+            )}
+            <Button className="h-11 w-full text-base" disabled={login.isPending}>
+              {login.isPending ? "登录中..." : challengeToken ? "验证登录" : "登录"}
+              {!login.isPending && <ArrowRight className="h-4 w-4" />}
+            </Button>
+            {challengeToken && <Button type="button" variant="ghost" className="w-full" onClick={() => setChallengeToken("")}>返回登录</Button>}
+          </form>
+        </div>
+        {!challengeToken && (
+          <div className="mt-5 flex items-center justify-center gap-2 text-sm text-muted-foreground">
+            <span>没有账号？</span>
+            <Button type="button" variant="link" className="h-auto px-0 text-sm" asChild>
               <Link to="/register">注册账号</Link>
             </Button>
-          )}
-        </form>
+          </div>
+        )}
       </div>
     </div>
   )