Add per-reply from-address selector and inbox address badges

- Reply composer shows a From dropdown (hello@ or nate@), defaulting
  to whichever address the inbound email was sent to
- Server validates the chosen address against an allowlist before sending
- Inbox list shows colored address badges: blue for hello@, purple for nate@

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

src/AdminPage.tsx

@@ -637,6 +637,7 @@ interface ContactReplyDraft {
   recipientEmail: string
   subject: string
   message: string
+  fromAddress: string
 }
 
 interface ContactReplyTemplate {
@@ -2751,12 +2752,18 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
           return match ? `Re: ${match[1].trim()}` : 'Re: Your message'
         })()
       : 'Thanks for reaching out to Verse by Verse with Nate'
+    // Default reply-from to whichever address the email was sent to
+    const inboundTo = submission.inboundTo ?? ''
+    const defaultFrom = inboundTo.includes('nate@')
+      ? 'Verse by Verse with Nate <nate@versebyversewithnate.us>'
+      : 'Verse by Verse with Nate <hello@versebyversewithnate.us>'
     setContactReplyDraft({
       submissionId: submission.id,
       recipientName: submission.name,
       recipientEmail: submission.email,
       subject: subjectLine,
       message: '',
+      fromAddress: defaultFrom,
     })
     setContactReplyStatus('idle')
     setContactReplyMsg(`Composing a reply to ${firstName}.`)
@@ -2827,6 +2834,7 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
         body: JSON.stringify({
           subject: contactReplyDraft.subject,
           message: contactReplyDraft.message,
+          fromAddress: contactReplyDraft.fromAddress,
         }),
       })
 
@@ -2836,7 +2844,8 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
       }
 
       setContactReplyStatus('sent')
-      setContactReplyMsg(`Reply sent to ${contactReplyDraft.recipientEmail} from hello@versebyversewithnate.us.`)
+      const sentFrom = contactReplyDraft.fromAddress.match(/<([^>]+)>/)?.[1] ?? contactReplyDraft.fromAddress
+      setContactReplyMsg(`Reply sent to ${contactReplyDraft.recipientEmail} from ${sentFrom}.`)
       await reloadContactReplyHistory()
       setContactReplyDraft(null)
     } catch (err) {
@@ -3312,7 +3321,20 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
                               <td><a href={`mailto:${c.email}`}>{c.email}</a></td>
                               <td>
                                 <span className="admin-badge admin-badge--pending" style={{ fontSize: '0.7rem' }}>{c.messageType ?? 'contact'}</span>
-                                {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>}
+                                {c.source === 'inbound-email' && (
+                                  <span
+                                    className="admin-badge"
+                                    style={{
+                                      fontSize: '0.7rem',
+                                      marginLeft: '0.3rem',
+                                      background: c.inboundTo?.includes('nate@') ? '#7c3aed' : '#0369a1',
+                                      color: '#fff',
+                                    }}
+                                    title={c.inboundTo ?? 'Direct email'}
+                                  >
+                                    {c.inboundTo?.includes('nate@') ? 'nate@' : 'hello@'}
+                                  </span>
+                                )}
                               </td>
                               <td style={{ textAlign: 'center' }}>{c.subscribe ? '✓' : ''}</td>
                               <td style={{ whiteSpace: 'nowrap' }}>{formatDate(c.submittedAt)}</td>
@@ -5123,7 +5145,14 @@ export default function AdminPage({ content, onSave, onLogout }: Props) {
                     </div>
                     <div className="admin-field">
                       <label htmlFor="reply-from">From</label>
-                      <input id="reply-from" type="text" value="hello@versebyversewithnate.us" readOnly />
+                      <select
+                        id="reply-from"
+                        value={contactReplyDraft.fromAddress}
+                        onChange={e => setContactReplyDraft(draft => draft ? { ...draft, fromAddress: e.target.value } : draft)}
+                      >
+                        <option value="Verse by Verse with Nate <hello@versebyversewithnate.us>">hello@versebyversewithnate.us</option>
+                        <option value="Verse by Verse with Nate <nate@versebyversewithnate.us>">nate@versebyversewithnate.us</option>
+                      </select>
                     </div>
                     <div className="admin-field">
                       <label htmlFor="reply-subject">Subject</label>