Partner promo codes: reusable codes that add free ad credits, tracked per redemption

promos.js (promo_codes + promo_redemptions, JSON fallback): create/update codes with
credits, partner, optional cap and expiry, on/off. Redeemed once per account either
from a join link ?promo=CODE (cookie, applied at signup) or the Overview box
'Have a promo code?' (/api/my/promo/redeem). Admin > Traffic gets a Partner promo
codes card (create, toggle, uses, recent redemptions). Chatbot line added.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/assets/my.js

@@ -2215,3 +2215,22 @@
 
   render();
 })();
+
+// ── partner promo codes: typed on the Overview (Marty, 2026-09-12) ──
+(function () {
+  const btn = document.getElementById('promoApply'), inp = document.getElementById('promoCode'), msg = document.getElementById('promoMsg');
+  if (!btn || !inp) return;
+  const say = (t, ok) => { msg.hidden = false; msg.textContent = t; msg.style.color = ok ? 'var(--mint)' : '#ff8a8a'; };
+  const go = async () => {
+    const code = inp.value.trim(); if (!code) { say('Enter a promo code.', false); return; }
+    btn.disabled = true;
+    try {
+      const r = await (await fetch('/api/my/promo/redeem', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ code }) })).json();
+      if (r.error) { say(r.error, false); return; }
+      say('Added ' + Number(r.credits).toLocaleString() + ' credits' + (r.partner ? ' from ' + r.partner : '') + '. They are in your balance now.', true);
+      inp.value = ''; if (typeof loadDashboard === 'function') loadDashboard();
+    } catch (e) { say('Could not apply that code. Try again.', false); }
+    finally { btn.disabled = false; }
+  };
+  btn.addEventListener('click', go); inp.addEventListener('keydown', e => { if (e.key === 'Enter') go(); });
+})();