feat(pitch-deck): add pitch version selection to investor invite form

- Version dropdown on the invite form shows all committed versions
- Selected version is assigned to the investor at creation time (no separate step needed)
- API validates version is committed before upserting
- Leaving the dropdown empty keeps any existing assignment (COALESCE behavior)
- version_id included in audit log

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

pitch-deck/app/pitch-admin/(authed)/investors/new/page.tsx

@@ -3,7 +3,7 @@
 import { useState, useMemo, useEffect, useRef } from 'react'
 import { useRouter } from 'next/navigation'
 import Link from 'next/link'
-import { ArrowLeft, Eye, Send, Link2, Copy, Check, Mail, MailX } from 'lucide-react'
+import { ArrowLeft, Eye, Send, Link2, Copy, Check, Mail, MailX, Layers } from 'lucide-react'
 import {
   DEFAULT_MESSAGE, DEFAULT_CLOSING,
   DEFAULT_MESSAGE_EN, DEFAULT_CLOSING_EN,
@@ -12,6 +12,13 @@ import {
 
 type Lang = 'de' | 'en'
 
+interface Version {
+  id: string
+  name: string
+  status: string
+  created_at: string
+}
+
 export default function NewInvestorPage() {
   const router = useRouter()
   const [email, setEmail] = useState('')
@@ -19,6 +26,8 @@ export default function NewInvestorPage() {
   const [company, setCompany] = useState('')
   const [lang, setLang] = useState<Lang>('de')
   const [sendEmail, setSendEmail] = useState(true)
+  const [versionId, setVersionId] = useState('')
+  const [versions, setVersions] = useState<Version[]>([])
   const [greeting, setGreeting] = useState('')
   const [message, setMessage] = useState(DEFAULT_MESSAGE)
   const [closing, setClosing] = useState(DEFAULT_CLOSING)
@@ -33,6 +42,13 @@ export default function NewInvestorPage() {
   const ttl = process.env.NEXT_PUBLIC_MAGIC_LINK_TTL_HOURS || '72'
   const effectiveGreeting = greeting || getDefaultGreeting(name || null, lang)
 
+  useEffect(() => {
+    fetch('/api/admin/versions')
+      .then(r => r.json())
+      .then(d => setVersions((d.versions ?? []).filter((v: Version) => v.status === 'committed')))
+      .catch(() => {})
+  }, [])
+
   // When language changes, swap defaults unless the user has manually edited
   useEffect(() => {
     if (lang === prevLang.current) return
@@ -58,6 +74,7 @@ export default function NewInvestorPage() {
           company,
           lang,
           send_email: sendEmail,
+          version_id: versionId || null,
           ...(sendEmail && {
             greeting: effectiveGreeting,
             message,
@@ -207,6 +224,27 @@ export default function NewInvestorPage() {
             />
           </div>
 
+          {/* Pitch Version */}
+          <div>
+            <label htmlFor="version" className="block text-xs font-medium text-white/60 uppercase tracking-wider mb-2">
+              <span className="inline-flex items-center gap-1.5"><Layers className="w-3.5 h-3.5" /> Pitch-Version <span className="text-white/30 text-[10px] normal-case">(optional)</span></span>
+            </label>
+            <select
+              id="version"
+              value={versionId}
+              onChange={(e) => setVersionId(e.target.value)}
+              className="w-full bg-black/30 border border-white/10 rounded-lg px-3 py-2.5 text-white focus:outline-none focus:ring-2 focus:ring-indigo-500/40 appearance-none"
+            >
+              <option value="">— Standard (keine spezifische Version) —</option>
+              {versions.map(v => (
+                <option key={v.id} value={v.id}>{v.name}</option>
+              ))}
+            </select>
+            {versions.length === 0 && (
+              <p className="text-[10px] text-white/25 mt-1">Keine committed Versionen vorhanden</p>
+            )}
+          </div>
+
           <hr className="border-white/[0.06]" />
 
           {/* Language toggle + Send email toggle */}