fix(hq-web): guard client dialog against double-submit and cancel-during-save

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/hq-web/src/components/ClientFormDialog.tsx

@@ -38,6 +38,7 @@ export function ClientFormDialog(props: {
     setContacts((prev) => prev.map((c, j) => (j === i ? { ...c, [k]: e.target.value } : c)))
 
   const save = () => {
+    if (saving) return
     if (f.name.trim() === '') { setError('Name is required'); return }
     if (!/^\d{2}$/.test(f.stateCode.trim())) { setError('State code must be two digits'); return }
     const cleaned: ClientContact[] = contacts
@@ -72,12 +73,12 @@ export function ClientFormDialog(props: {
   return (
     <Dialog
       open={props.open}
-      onClose={props.onClose}
+      onClose={() => { if (!saving) props.onClose() }}
       title={editing ? `Edit ${props.initial!.name}` : 'New client'}
       size="lg"
       footer={
         <>
-          <Button pill onClick={props.onClose}>Cancel</Button>
+          <Button pill onClick={() => { if (!saving) props.onClose() }}>Cancel</Button>
           <Button pill tone="primary" onClick={save}>{saving ? 'Saving…' : editing ? 'Save changes' : 'Create client'}</Button>
         </>
       }