feat(pitch-deck): self-service magic-link reissue on /auth

Investors who lost their session or whose invite token was already used
can now enter their email on /auth to receive a fresh access link,
without needing a manual re-invite from an admin.

- New /api/auth/request-link endpoint looks up the investor by email,
  issues a new pitch_magic_links row, and emails the link via the
  existing sendMagicLinkEmail path. Response is generic regardless of
  whether the email exists (enumeration resistance) and silently no-ops
  for revoked investors.
- Rate-limited both per-IP (authVerify preset) and per-email (magicLink
  preset, 3/hour — same ceiling as admin-invite/resend).
- /auth page now renders an email form; submits to the new endpoint and
  shows a generic "if invited, link sent" confirmation.
- Route-level tests cover validation, normalization, unknown email,
  revoked investor, and both rate-limit paths.
- End-to-end regression test wires request-link + verify against an
  in-memory fake DB and asserts the full flow: original invite used →
  replay rejected → email submission → fresh link → verify succeeds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pitch-deck/app/auth/page.tsx

@@ -1,8 +1,43 @@
 'use client'
 
 import { motion } from 'framer-motion'
+import { useState, FormEvent } from 'react'
+
+type Status = 'idle' | 'submitting' | 'sent' | 'error'
 
 export default function AuthPage() {
+  const [email, setEmail] = useState('')
+  const [status, setStatus] = useState<Status>('idle')
+  const [message, setMessage] = useState<string | null>(null)
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    if (!email.trim()) return
+
+    setStatus('submitting')
+    setMessage(null)
+
+    try {
+      const res = await fetch('/api/auth/request-link', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email: email.trim() }),
+      })
+      const data = await res.json().catch(() => ({}))
+
+      if (res.ok) {
+        setStatus('sent')
+        setMessage(data.message || 'If this email was invited, a fresh access link has been sent.')
+      } else {
+        setStatus('error')
+        setMessage(data.error || 'Something went wrong. Please try again.')
+      }
+    } catch {
+      setStatus('error')
+      setMessage('Network error. Please try again.')
+    }
+  }
+
   return (
     <div className="h-screen flex items-center justify-center bg-[#0a0a1a] relative overflow-hidden">
       {/* Background gradient */}
@@ -35,9 +70,44 @@ export default function AuthPage() {
 
           <p className="text-white/50 text-sm leading-relaxed mb-6">
             This interactive pitch deck is available by invitation only.
-            Please check your email for an access link.
+            If you were invited, enter your email below and we&apos;ll send you a fresh access link.
           </p>
 
+          {status === 'sent' ? (
+            <div className="text-left bg-indigo-500/10 border border-indigo-500/20 rounded-lg p-4 mb-5">
+              <p className="text-indigo-200/90 text-sm leading-relaxed">
+                {message}
+              </p>
+            </div>
+          ) : (
+            <form onSubmit={handleSubmit} className="text-left mb-5">
+              <label htmlFor="email" className="block text-white/60 text-xs mb-2 uppercase tracking-wide">
+                Email address
+              </label>
+              <input
+                id="email"
+                type="email"
+                required
+                autoComplete="email"
+                value={email}
+                onChange={(e) => setEmail(e.target.value)}
+                disabled={status === 'submitting'}
+                placeholder="you@example.com"
+                className="w-full bg-white/[0.04] border border-white/[0.08] rounded-lg px-4 py-3 text-white/90 text-sm placeholder:text-white/20 focus:outline-none focus:border-indigo-400/50 focus:bg-white/[0.06] transition-colors disabled:opacity-50"
+              />
+              {status === 'error' && message && (
+                <p className="mt-2 text-rose-300/80 text-xs">{message}</p>
+              )}
+              <button
+                type="submit"
+                disabled={status === 'submitting' || !email.trim()}
+                className="w-full mt-4 bg-gradient-to-br from-indigo-500 to-purple-500 hover:from-indigo-400 hover:to-purple-400 disabled:opacity-40 disabled:cursor-not-allowed text-white text-sm font-medium rounded-lg px-4 py-3 transition-all"
+              >
+                {status === 'submitting' ? 'Sending…' : 'Send access link'}
+              </button>
+            </form>
+          )}
+
           <div className="border-t border-white/[0.06] pt-5">
             <p className="text-white/30 text-xs">
               Questions? Contact us at{' '}