fix(mcs150): point intake email to per-slug wizard (not sales page) + add Trailers field

The MCS-150 intake-completion email linked customers to /order/dot-compliance,
which is the sales/checkout page -- it ignores ?order= and asks the customer to
re-pick services and pay again, so they 'cannot enter any data' (Paul Wilson's
report). Link to the per-service intake wizard /order/<slug>?order=... instead,
which loads the paid order, pre-fills from the FMCSA census, and drops payment.

Also add a Trailers field to the DOT intake fleet section and wire it through to
the MCS-150 PDF Q26 trailer row, so carriers can update trucks AND trailers.

scripts/document_gen/templates/mcs150_pdf_filler.py

@@ -319,6 +319,11 @@ def fill_mcs150(intake: dict, order_number: str = "") -> str:
             intake.get("primary_vehicle_type", "straight"), "straight")
         if power_units not in (None, ""):
             field_updates[f"{prefix}Own"] = str(power_units)
+        # Simple intake also collects a flat trailer count (no owned/leased
+        # breakdown). Default trailers to the Owned column of the trailer row.
+        trailers = intake.get("trailers", "")
+        if trailers not in (None, "", 0, "0"):
+            field_updates["trailerOwn"] = str(trailers)
 
     # Non-CMV count, if provided.
     if intake.get("non_cmv_vehicles") not in (None, ""):

scripts/workers/services/mcs150_update.py

@@ -200,7 +200,7 @@ class MCS150UpdateHandler:
             missing = self._missing_intake_fields(slug, intake)
             if missing and not client_approved and not admin_approved:
                 self._request_intake_completion(
-                    order_number, entity_name, customer_email, dot_number, missing)
+                    order_number, entity_name, customer_email, dot_number, missing, slug)
                 LOG.info("[%s] Held for customer intake completion; missing=%s",
                          order_number, missing)
                 return []
@@ -222,7 +222,7 @@ class MCS150UpdateHandler:
                 self._persist_intake(order_number, intake)
                 self._set_fulfillment_status(order_number, "awaiting_intake")
                 self._request_intake_completion(
-                    order_number, entity_name, customer_email, dot_number, missing)
+                    order_number, entity_name, customer_email, dot_number, missing, slug)
                 LOG.info("[%s] Admin-assisted %s held for intake; missing=%s",
                          order_number, slug, missing)
                 return []
@@ -521,11 +521,17 @@ class MCS150UpdateHandler:
         return missing
 
     def _request_intake_completion(self, order_number, entity_name,
-                                   customer_email, dot_number, missing):
+                                   customer_email, dot_number, missing, slug=None):
         """Email the customer a census-pre-filled intake link and create a
         low-priority admin todo noting we're waiting on intake completion."""
         domain = os.environ.get("PUBLIC_SITE_URL", "https://performancewest.net").rstrip("/")
-        intake_url = f"{domain}/order/dot-compliance?order={order_number}"
+        # Link to the per-service intake WIZARD (/order/<slug>?order=...), which
+        # loads the existing paid order, pre-fills it from the FMCSA census, and
+        # drops the payment step. Do NOT link to /order/dot-compliance -- that is
+        # the sales/checkout page; it ignores ?order= and asks the customer to
+        # re-select services and pay again (they can't "enter any data" there).
+        intake_slug = slug or self.SERVICE_SLUG
+        intake_url = f"{domain}/order/{intake_slug}?order={order_number}"
 
         # Customer email (no paper/mail mechanics; public form names are fine).
         try:

site/src/components/intake/steps/DOTIntakeStep.astro

@@ -102,8 +102,12 @@
       <div class="pw-row-3">
         <label class="pw-field"><span>Power Units (trucks) <em>*</em></span>
           <input type="number" id="dot-power-units" required min="0" placeholder="e.g. 5" /></label>
+        <label class="pw-field"><span>Trailers</span>
+          <input type="number" id="dot-trailers" min="0" placeholder="e.g. 2" /></label>
         <label class="pw-field"><span>Drivers <em>*</em></span>
           <input type="number" id="dot-drivers" required min="0" placeholder="e.g. 6" /></label>
+      </div>
+      <div class="pw-row-2">
         <label class="pw-field"><span>Annual Miles</span>
           <input type="number" id="dot-miles" min="0" placeholder="e.g. 250000" /></label>
       </div>
@@ -441,6 +445,7 @@
       "dot-entity-type": d.entity_type || "", "dot-carrier-op": d.carrier_operation || "",
       "dot-interstate": d.interstate_intrastate || "", "dot-hazmat": d.hazmat || "",
       "dot-power-units": d.power_units || "", "dot-drivers": d.drivers || "",
+      "dot-trailers": d.trailers || "",
       "dot-miles": d.annual_miles || "", "dot-signer-name": d.signer_name || "",
       "dot-signer-title": d.signer_title || "", "dot-cdl-drivers": d.cdl_drivers || "",
       "dot-owner-ops": d.owner_operators || "0", "dot-der-name": d.der_name || "",
@@ -508,6 +513,7 @@
       entity_type: val("dot-entity-type"), carrier_operation: val("dot-carrier-op"),
       interstate_intrastate: val("dot-interstate"), hazmat: val("dot-hazmat"),
       power_units: val("dot-power-units"), drivers: val("dot-drivers"),
+      trailers: val("dot-trailers"),
       annual_miles: val("dot-miles"), cargo_types: cargoTypes,
       signer_name: val("dot-signer-name"), signer_title: val("dot-signer-title"),
       fleet_size_bracket: val("dot-ucr-bracket"), base_state: val("dot-ucr-state"),