Add inbound email capture via Cloudflare Email Worker

- Cloudflare Email Worker forwards hello@ and nate@ to Gmail and POSTs
  parsed MIME email to /api/inbound-email as admin inbox entries
- New server route authenticates via shared secret and deduplicates by
  Message-ID before storing inbound emails as contact submissions
- Admin inbox shows "email" badge for inbound messages; reply composer
  opens blank with auto-subject "Re: [original]" and signature preview
- Documents setup steps in cloudflare/email-worker.js and .env.example

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

src/AdminPage.tsx

@@ -626,6 +626,8 @@ interface ContactSubmission {
   messageType: 'question' | 'testimony' | 'topic' | 'general'
   subscribe: boolean
   archived?: boolean
+  source?: 'contact-form' | 'download' | 'inbound-email'
+  inboundTo?: string
 }
 
 interface ContactReplyDraft {
@@ -2722,15 +2724,23 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
 
   function openContactReplyComposer(submission: ContactSubmission) {
     const firstName = submission.name?.trim().split(/\s+/)[0] || 'there'
+    const isInbound = submission.source === 'inbound-email'
+    // For inbound emails, extract the original subject from the stored message
+    const subjectLine = isInbound
+      ? (() => {
+          const match = /^Subject: (.+)/m.exec(submission.message ?? '')
+          return match ? `Re: ${match[1].trim()}` : 'Re: Your message'
+        })()
+      : 'Thanks for reaching out to Verse by Verse with Nate'
     setContactReplyDraft({
       submissionId: submission.id,
       recipientName: submission.name,
       recipientEmail: submission.email,
-      subject: 'Thanks for reaching out to Verse by Verse with Nate',
-      message: `Thank you for reaching out.\n\nI appreciate your message and wanted to follow up personally.`,
+      subject: subjectLine,
+      message: '',
     })
     setContactReplyStatus('idle')
-    setContactReplyMsg(`Composing a reply to ${firstName}.`) 
+    setContactReplyMsg(`Composing a reply to ${firstName}.`)
   }
 
   function applyContactReplyTemplate(templateId: string) {
@@ -3282,7 +3292,10 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
                                 {c.submissionCount > 1 && <div className="admin-stats-note" style={{ margin: '0.2rem 0 0' }}>{c.submissionCount} submissions</div>}
                               </td>
                               <td><a href={`mailto:${c.email}`}>{c.email}</a></td>
-                              <td><span className="admin-badge admin-badge--pending" style={{ fontSize: '0.7rem' }}>{c.messageType ?? 'contact'}</span></td>
+                              <td>
+                                <span className="admin-badge admin-badge--pending" style={{ fontSize: '0.7rem' }}>{c.messageType ?? 'contact'}</span>
+                                {c.source === 'inbound-email' && <span className="admin-badge admin-badge--info" style={{ fontSize: '0.7rem', marginLeft: '0.3rem' }} title={c.inboundTo ? `To: ${c.inboundTo}` : 'Direct email'}>email</span>}
+                              </td>
                               <td style={{ textAlign: 'center' }}>{c.subscribe ? '✓' : ''}</td>
                               <td style={{ whiteSpace: 'nowrap' }}>{formatDate(c.submittedAt)}</td>
                               <td style={{ maxWidth: '280px', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }} title={c.message}>{c.message ?? '—'}</td>
@@ -5095,10 +5108,14 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
                       <textarea
                         id="reply-message"
                         rows={8}
+                        placeholder="Type your reply here…"
                         value={contactReplyDraft.message}
                         onChange={e => setContactReplyDraft(draft => draft ? { ...draft, message: e.target.value } : draft)}
                       />
-                      <p className="admin-stats-note">This will be wrapped in a professional HTML email template automatically.</p>
+                      <div className="admin-stats-note" style={{ borderLeft: '3px solid #ccc', paddingLeft: '0.6rem', marginTop: '0.4rem', color: '#666', fontStyle: 'italic', whiteSpace: 'pre-line' }}>
+                        {'Grace and peace,\nVerse by Verse with Nate'}
+                        <span style={{ display: 'block', marginTop: '0.25rem', fontSize: '0.75em', fontStyle: 'normal', color: '#999' }}>Your signature — appended automatically</span>
+                      </div>
                     </div>
                   </div>
                   <div style={{ display: 'flex', gap: '0.5rem' }}>