feat: add regex validation for funnel steps and improve error handling in CreateFunnelPage

app/sites/[id]/funnels/new/page.tsx

@@ -6,6 +6,15 @@ import { createFunnel, type CreateFunnelRequest, type FunnelStep } from '@/lib/a
 import { toast, Input, Button, ChevronLeftIcon, PlusIcon, TrashIcon } from '@ciphera-net/ui'
 import Link from 'next/link'
 
+function isValidRegex(pattern: string): boolean {
+  try {
+    new RegExp(pattern)
+    return true
+  } catch {
+    return false
+  }
+}
+
 export default function CreateFunnelPage() {
   const params = useParams()
   const router = useRouter()
@@ -13,6 +22,7 @@ export default function CreateFunnelPage() {
 
   const [name, setName] = useState('')
   const [description, setDescription] = useState('')
+  // * Backend requires at least one step (API binding min=1, DB rejects empty steps)
   const [steps, setSteps] = useState<Omit<FunnelStep, 'order'>[]>([
     { name: 'Step 1', value: '/', type: 'exact' },
     { name: 'Step 2', value: '', type: 'exact' }
@@ -47,6 +57,10 @@ export default function CreateFunnelPage() {
       toast.error('Please enter a path for all steps')
       return
     }
+    if (steps.some(s => s.type === 'regex' && !isValidRegex(s.value))) {
+      toast.error('Invalid regex in one or more steps. Check the pattern for steps with type "regex".')
+      return
+    }
 
     try {
       setSaving(true)

lib/api/funnels.ts

@@ -66,7 +66,7 @@ export async function deleteFunnel(siteId: string, funnelId: string): Promise<vo
 
 const DATE_ONLY_REGEX = /^\d{4}-\d{2}-\d{2}$/
 
-/** Normalize date-only (YYYY-MM-DD) to RFC3339 for backend funnel stats API. */
+/** Normalize date-only (YYYY-MM-DD) to RFC3339 for backend funnel stats API. Uses UTC for boundaries (API/server timestamps are UTC). */
 function toRFC3339Range(from: string, to: string): { from: string; to: string } {
   return {
     from: DATE_ONLY_REGEX.test(from) ? `${from}T00:00:00.000Z` : from,