Fix #5: createSSRequest fails fast when storeNumber is missing

- New SUBTYPES_REQUIRING_STORE_NUMBER set (seeded with every current
  subType, all of which mark Store Number required in JSM). Adding a
  future subType that does NOT require Store Number is a one-line omit.
- createSSRequest now trims storeNumber (rejects whitespace-only) and
  throws a 400 with a clear message ("storeNumber is required for
  subType ...") before making any Jira API call.
- Validation errors now carry err.status = 400 so future non-route
  callers can distinguish client errors from Jira failures.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/services/jiraService.js

@@ -683,6 +683,12 @@ const REQUEST_TYPE_MAP = {
   'Store Transportation Request': 493,
 };
 
+// SubTypes that require a storeNumber. Every currently-supported subType maps
+// to a request type whose Store Number field is `required: true` in JSM (see
+// ss-fields-*.json). Kept as an explicit set so a future subType that does NOT
+// require Store Number can be added by simply omitting it from this set.
+const SUBTYPES_REQUIRING_STORE_NUMBER = new Set(Object.keys(REQUEST_TYPE_MAP));
+
 /**
  * Create a Store Support ticket (JSM request) using the Service Desk API.
  * @param {Object} params
@@ -1350,12 +1356,29 @@ export async function createSSRequest(params = {}) {
   } = params;
 
   if (!subType || !summary) {
-    throw new Error('subType and summary are required');
+    const err = new Error('subType and summary are required');
+    err.status = 400;
+    throw err;
   }
 
   const requestTypeId = REQUEST_TYPE_MAP[subType];
   if (!requestTypeId) {
-    throw new Error(`Unknown subType: "${subType}". Must be one of the supported values.`);
+    const err = new Error(`Unknown subType: "${subType}". Must be one of the supported values.`);
+    err.status = 400;
+    throw err;
+  }
+
+  // Fail-fast: every current subType requires Store Number. Catching this
+  // client-side gives a clean API error instead of forwarding to Jira and
+  // getting back an opaque "Please provide a value for required field
+  // 'Store Number'" that references Jira internals.
+  const normalizedStoreNumber = storeNumber != null && String(storeNumber).trim() !== ''
+    ? String(storeNumber).trim()
+    : null;
+  if (SUBTYPES_REQUIRING_STORE_NUMBER.has(subType) && !normalizedStoreNumber) {
+    const err = new Error(`storeNumber is required for subType "${subType}"`);
+    err.status = 400;
+    throw err;
   }
 
   const serviceDeskId = config.jira.serviceDeskId || '170';
@@ -1369,9 +1392,9 @@ export async function createSSRequest(params = {}) {
     ...additional
   };
 
-  if (storeNumber) {
+  if (normalizedStoreNumber) {
     // Resolve to proper Assets object reference: [ { "objectId": "82288" } ]
-    const storeRef = await resolveStoreAssetReference(storeNumber);
+    const storeRef = await resolveStoreAssetReference(normalizedStoreNumber);
     if (storeRef) {
       requestFieldValues[storeCustomField] = storeRef;
     }