add /login route

POSTs email + password to /auth/email/login, stores JWT, redirects
to /account (route to be added).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/routes.ts

@@ -4,4 +4,5 @@ export default [
   index('routes/_index.tsx'),
   route('signup', 'routes/signup.tsx'),
   route('verify', 'routes/verify.tsx'),
+  route('login', 'routes/login.tsx'),
 ] satisfies RouteConfig;

app/routes/login.tsx

@@ -0,0 +1,104 @@
+import { useState } from 'react';
+
+const API_URL = import.meta.env.VITE_API_URL ?? 'https://api.t4t-gateway.com';
+
+export function meta() {
+  return [{ title: 'Log in · t4t Gateway' }];
+}
+
+export default function Login() {
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setError(null);
+    setSubmitting(true);
+    try {
+      const res = await fetch(`${API_URL}/auth/email/login`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email, password }),
+      });
+      const body = await res.json();
+      if (!res.ok) {
+        throw new Error(body?.message ?? body?.error ?? `Login failed (${res.status})`);
+      }
+      localStorage.setItem('jwt', body.token);
+      window.location.href = '/account';
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setSubmitting(false);
+    }
+  }
+
+  return (
+    <main className='flex min-h-screen items-center justify-center px-6'>
+      <form
+        onSubmit={onSubmit}
+        className='w-full max-w-md rounded-lg border border-neutral-200 bg-white p-8 shadow-sm'
+      >
+        <h1 className='text-2xl font-semibold'>Log in</h1>
+        <p className='mt-2 text-sm text-neutral-600'>
+          Welcome back.
+        </p>
+
+        <div className='mt-6 space-y-4'>
+          <div>
+            <label htmlFor='email' className='block text-sm font-medium'>
+              Email
+            </label>
+            <input
+              id='email'
+              type='email'
+              autoComplete='email'
+              required
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              className='mt-1 block w-full rounded-md border border-neutral-300 px-3 py-2 text-sm shadow-sm focus:border-neutral-900 focus:outline-none focus:ring-1 focus:ring-neutral-900'
+            />
+          </div>
+
+          <div>
+            <label htmlFor='password' className='block text-sm font-medium'>
+              Password
+            </label>
+            <input
+              id='password'
+              type='password'
+              autoComplete='current-password'
+              required
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              className='mt-1 block w-full rounded-md border border-neutral-300 px-3 py-2 text-sm shadow-sm focus:border-neutral-900 focus:outline-none focus:ring-1 focus:ring-neutral-900'
+            />
+          </div>
+        </div>
+
+        {error && (
+          <p className='mt-4 rounded-md bg-red-50 px-3 py-2 text-sm text-red-700'>
+            {error}
+          </p>
+        )}
+
+        <button
+          type='submit'
+          disabled={submitting}
+          className='mt-6 inline-flex h-10 w-full items-center justify-center rounded-md bg-neutral-900 px-5 text-sm font-medium text-white hover:bg-neutral-700 disabled:opacity-50'
+        >
+          {submitting ? 'Logging in…' : 'Log in'}
+        </button>
+
+        <p className='mt-4 text-center text-sm text-neutral-600'>
+          No account?{' '}
+          <a href='/signup' className='font-medium text-neutral-900 underline'>
+            Sign up
+          </a>
+        </p>
+      </form>
+    </main>
+  );
+}