trucking: same-day expiring coupon to drive immediate conversion

The sales we got came at $79 + a 24hr coupon; cutting MCS-150 to $39 flat
removed urgency and conversions did NOT improve (a permanent low price sets a
new anchor and lets people defer). Restore the higher anchor and let an
expiring discount create the now-or-lose-it decision.

- Restore MCS-150 anchor $39 -> $79 (catalog single source + regenerated).
- build_trucking_campaigns.py: mint ONE random 5-letter coupon per send-day
  (40% off, valid through 23:59:59 ET that day) into the existing discount_codes
  table; inject coupon_code/pct/expires + a ?code= LP link into every email.
  Idempotent per day; service-fee-only scope (gov/pass-through fees never cut).
- Listmonk MCS-150 (186) + Inactive USDOT (188) templates: lead with the
  struck-through anchor + sale price + code + 'expires tonight', and point the
  primary CTA at the order page (with code) instead of the 'free check' tool.
- OrderPriceBanner: validates ?code= via /api/v1/discount and shows
  was/now + expiry; Wizard forwards the code to order creation.
- Verified: code gen, expiry math, scope enforcement, discount API
  (40% off $79 = $47.40), site+api builds clean.

site/src/components/OrderPriceBanner.astro

@@ -5,17 +5,29 @@ export interface Props {
   priceCents?: number;
   govFeeLabel?: string;
   note?: string;
+  serviceSlug?: string;
 }
 
-const { priceCents, govFeeLabel, note } = Astro.props;
+const { priceCents, govFeeLabel, note, serviceSlug } = Astro.props;
 const hasPrice = typeof priceCents === "number";
+const API = import.meta.env.PUBLIC_API_URL || "";
 ---
 
 {hasPrice && (
-  <aside class="pw-price-banner" aria-label="Service price">
+  <aside
+    class="pw-price-banner"
+    aria-label="Service price"
+    data-price-cents={priceCents}
+    data-service-slug={serviceSlug || ""}
+    data-api={API}
+  >
     <div>
       <p class="pw-price-label">Service fee</p>
-      <p class="pw-price-value">{formatUSD(priceCents!)}</p>
+      <p class="pw-price-value">
+        <span class="pw-price-anchor" hidden></span>
+        <span class="pw-price-now">{formatUSD(priceCents!)}</span>
+      </p>
+      <p class="pw-price-deal" hidden></p>
     </div>
     <div class="pw-price-copy">
       {govFeeLabel ? (
@@ -28,6 +40,46 @@ const hasPrice = typeof priceCents === "number";
   </aside>
 )}
 
+<script>
+  // Same-day campaign coupon: if the visitor arrived via ?code=XXXXX, validate
+  // it and surface the deal (struck-through anchor + discounted price + expiry).
+  // The discount applies to the service fee only; pass-through fees are unaffected.
+  (async () => {
+    const banner = document.querySelector<HTMLElement>(".pw-price-banner");
+    if (!banner) return;
+    const code = (new URLSearchParams(location.search).get("code") || "").toUpperCase().trim();
+    if (!code) return;
+
+    const priceCents = parseInt(banner.dataset.priceCents || "0", 10);
+    const slug = banner.dataset.serviceSlug || "";
+    const api = banner.dataset.api || "";
+    if (!priceCents) return;
+
+    try {
+      const url = `${api}/api/v1/discount/${encodeURIComponent(code)}`
+        + `?amount=${priceCents}${slug ? `&service=${encodeURIComponent(slug)}` : ""}`;
+      const r = await fetch(url);
+      if (!r.ok) return;
+      const d = await r.json();
+      if (!d || !d.valid || !d.discount_cents) return;
+
+      const now = priceCents - d.discount_cents;
+      const fmt = (c: number) => `$${(c / 100).toFixed(c % 100 === 0 ? 0 : 2)}`;
+
+      const anchor = banner.querySelector<HTMLElement>(".pw-price-anchor");
+      const nowEl = banner.querySelector<HTMLElement>(".pw-price-now");
+      const deal = banner.querySelector<HTMLElement>(".pw-price-deal");
+      if (anchor) { anchor.textContent = fmt(priceCents); anchor.hidden = false; }
+      if (nowEl) nowEl.textContent = fmt(now);
+      if (deal) {
+        const pct = d.discount_type === "percent" ? `${d.discount_value}% off` : `${fmt(d.discount_cents)} off`;
+        deal.innerHTML = `<strong>${pct}</strong> with code <strong>${code}</strong> &middot; expires 11:59 PM ET tonight`;
+        deal.hidden = false;
+      }
+    } catch { /* no-op: fall back to full price */ }
+  })();
+</script>
+
 <style>
   .pw-price-banner {
     display: flex;
@@ -56,6 +108,19 @@ const hasPrice = typeof priceCents === "number";
     line-height: 1;
     font-weight: 900;
   }
+  .pw-price-anchor {
+    color: #9ca3af;
+    font-weight: 700;
+    text-decoration: line-through;
+    font-size: 0.55em;
+    margin-right: 0.4em;
+  }
+  .pw-price-deal {
+    margin: 0.45rem 0 0;
+    color: #b91c1c;
+    font-size: 0.85rem;
+    font-weight: 700;
+  }
   .pw-price-copy {
     max-width: 30rem;
     color: #475569;

site/src/components/intake/Wizard.astro

@@ -639,6 +639,10 @@ const STEP_LABELS: Record<string, string> = {
             customer_name: name,
             customer_phone: d.phone || "",
             intake_data: state.intake_data,
+            // Same-day promo code from the campaign email link (?code=XXXXX).
+            // The server validates it (expiry + scope) and discounts the
+            // service fee only -- government/pass-through fees are never reduced.
+            discount_code: (new URLSearchParams(window.location.search).get("code") || "").toUpperCase().trim() || undefined,
           }),
         });
         if (!createResp.ok) {