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>

server/routes/contact.js

@@ -455,6 +455,7 @@ export function register(app) {
       const { id } = req.params
       const subject = typeof req.body?.subject === 'string' ? req.body.subject.trim() : ''
       const message = typeof req.body?.message === 'string' ? req.body.message.trim() : ''
+      const requestedFrom = typeof req.body?.fromAddress === 'string' ? req.body.fromAddress.trim() : ''
 
       if (!id || typeof id !== 'string') {
         res.status(400).json({ message: 'Invalid submission id.' }); return
@@ -477,7 +478,12 @@ export function register(app) {
       const recipientName = splitName(submission.name).firstName || submission.name || 'friend'
       const html = buildAdminReplyTemplate({ recipientName, message })
       const replyToAddress = getResendReplyToAddress()
-      const fromAddress = getResendFromAddress()
+      const defaultFrom = getResendFromAddress() || ADMIN_REPLY_FROM
+      const ALLOWED_FROM = [
+        'Verse by Verse with Nate <hello@versebyversewithnate.us>',
+        'Verse by Verse with Nate <nate@versebyversewithnate.us>',
+      ]
+      const fromAddress = ALLOWED_FROM.includes(requestedFrom) ? requestedFrom : defaultFrom
       const text = `Hi ${recipientName},\n\n${message}\n\nGrace and peace,\nVerse by Verse with Nate\n${replyToAddress}`
       const resend = new Resend(process.env.RESEND_API_KEY)
 
@@ -485,7 +491,7 @@ export function register(app) {
         resend,
         context: 'admin-contact-reply',
         payload: {
-          from: fromAddress || ADMIN_REPLY_FROM,
+          from: fromAddress,
           to: [submission.email],
           subject,
           replyTo: replyToAddress,