fix(portal): send preferredTime as HH:MM:SS and format booking slot labels (GRO-2211) (#51)

src/portal/sections/Appointments.tsx

@@ -110,6 +110,41 @@ export function parseTimeTo24Hour(time: string | null | undefined): string {
   return `${hours24.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:00`;
 }
 
+// A booking slot is the canonical UTC ISO instant returned by
+// `/api/book/availability` (e.g. "2026-06-09T10:00:00.000Z" is the 10:00 UTC
+// business slot — see api `src/lib/slots.ts`, which builds them with
+// `setUTCHours`). Display label and submit payload both derive from the slot via
+// these helpers so they never desync. Always format/extract in UTC: slots are
+// generated as UTC business hours, so a browser-local conversion would mislabel
+// the slot and diverge from the stored Postgres `time` column.
+export function formatSlotLabel(slot: string): string {
+  const d = new Date(slot);
+  // Non-ISO input (e.g. an already-formatted "10:00 AM" label) — show as-is.
+  if (Number.isNaN(d.getTime())) return slot;
+  return new Intl.DateTimeFormat('en-US', {
+    hour: 'numeric',
+    minute: '2-digit',
+    hour12: true,
+    timeZone: 'UTC',
+  }).format(d);
+}
+
+// Extracts the UTC `HH:MM:SS` time component the api stores in the Postgres
+// `time` column. The api inserts this verbatim, so a full ISO datetime here is
+// an `invalid input syntax for type time` 500 (GRO-2211).
+export function slotToTime(slot: string): string {
+  if (/^\d{2}:\d{2}:\d{2}$/.test(slot)) return slot; // already HH:MM:SS
+  const d = new Date(slot);
+  if (!Number.isNaN(d.getTime())) {
+    const hh = String(d.getUTCHours()).padStart(2, '0');
+    const mm = String(d.getUTCMinutes()).padStart(2, '0');
+    const ss = String(d.getUTCSeconds()).padStart(2, '0');
+    return `${hh}:${mm}:${ss}`;
+  }
+  // "10:00 AM"-style label fallback.
+  return parseTimeTo24Hour(slot);
+}
+
 export function isUpcoming(appt: Appointment): boolean {
   const now = new Date();
   // Prefer the absolute ISO `startTime` from the API; fall back to the
@@ -860,7 +895,7 @@ interface BookingFlowProps {
   sessionId: string | null;
 }
 
-function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
+export function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
   const [step, setStep] = useState(1);
   const [pets, setPets] = useState<Pet[]>([]);
   const [services, setServices] = useState<Service[]>([]);
@@ -972,7 +1007,7 @@ function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
           addOnIds: selectedAddOns.map((s) => s.id),
           groomerId: selectedGroomer === 'first-available' ? null : selectedGroomer,
           preferredDate: selectedDate,
-          preferredTime: selectedTime,
+          preferredTime: slotToTime(selectedTime),
           notes: notes || undefined,
           recurring: recurring || undefined,
         }),
@@ -1035,7 +1070,7 @@ function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
                 Appointment Requested!
               </h3>
               <p className="text-sm text-stone-500 mb-4">
-                {selectedPet?.name} on {formatDate(selectedDate)} at {selectedTime}
+                {selectedPet?.name} on {formatDate(selectedDate)} at {formatSlotLabel(selectedTime)}
               </p>
               <button
                 onClick={onClose}
@@ -1255,7 +1290,7 @@ function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
                               : 'border-stone-200 hover:border-stone-300'
                           }`}
                         >
-                          {time}
+                          {formatSlotLabel(time)}
                         </button>
                       ))}
                     </div>
@@ -1325,7 +1360,7 @@ function BookingFlow({ onClose, sessionId }: BookingFlowProps) {
                     <div className="flex justify-between">
                       <span className="text-stone-500">Date & Time</span>
                       <span className="font-medium">
-                        {formatDate(selectedDate)} at {selectedTime}
+                        {formatDate(selectedDate)} at {formatSlotLabel(selectedTime)}
                       </span>
                     </div>
                     {recurring && (