Rebrand to Sage & Cream identity, working contact form, drop Firebase

- New sage/cream palette and stacked logo lockup (The Vine over Coffeehouse
  + Bakery) driven by currentColor; logo SVGs now colorable
- Reuse the logo component for the hero and section marks
- Rewrite site copy: real founding (Morissa Bennett, 2024), real story from
  the product range, remove invented claims and AI phrasing
- Contact form now sends over SMTP via /api/contact (nodemailer) with real
  send/error states, server-side validation, and reply-to the customer;
  delivers to CONTACT_TO. Add .env.example and a test-email script
- Fix mobile: unmount the off-screen menu (killed sideways scroll), cap logo
  width, responsive heroes and type
- Remove Firebase (config, tracked build output, placeholder pages, nix
  firebase-tools) now that hosting has moved
- Delete dead code: LoyaltyCardForm, ProductModal, LoadingSpinner, card-flip
  CSS, unused Playfair font
- Serve dev/start on port 2024

scripts/test-email.mjs

@@ -0,0 +1,42 @@
+// Sends one test email through the configured SMTP server, then exits.
+//   node --env-file=.env scripts/test-email.mjs [recipient]
+// Verifies the connection first, so auth/TLS problems are reported distinctly
+// from delivery problems.
+import nodemailer from 'nodemailer';
+
+const { SMTP_SERVER, SMTP_PORT, SMTP_USERNAME, SMTP_TOKEN, CONTACT_FROM } = process.env;
+const to = process.argv[2] || process.env.CONTACT_TO;
+
+const missing = ['SMTP_SERVER', 'SMTP_PORT', 'SMTP_USERNAME', 'SMTP_TOKEN'].filter((k) => !process.env[k]);
+if (missing.length) {
+  console.error(`Missing env vars: ${missing.join(', ')}`);
+  console.error('Fill in .env (see .env.example), then re-run.');
+  process.exit(1);
+}
+if (!to) {
+  console.error('No recipient. Pass one as an argument or set CONTACT_TO.');
+  process.exit(1);
+}
+
+const port = Number(SMTP_PORT);
+const transporter = nodemailer.createTransport({
+  host: SMTP_SERVER,
+  port,
+  secure: port === 465,
+  auth: { user: SMTP_USERNAME, pass: SMTP_TOKEN },
+});
+
+console.log(`Connecting to ${SMTP_SERVER}:${port} (secure=${port === 465}) as ${SMTP_USERNAME}...`);
+await transporter.verify();
+console.log('SMTP connection and auth OK.');
+
+const info = await transporter.sendMail({
+  from: CONTACT_FROM || SMTP_USERNAME,
+  to,
+  subject: 'The Vine — contact form test',
+  text: 'This is a test from the itsthevine.com contact form wiring. If you are reading this, SMTP works.',
+});
+
+console.log(`Sent to ${to}`);
+console.log(`messageId: ${info.messageId}`);
+if (info.rejected?.length) console.log(`rejected: ${info.rejected.join(', ')}`);