Persist pet profile changes via PATCH /api/portal/pets/{petId}

- handlePetSave is now async; calls PATCH before updating local state
- API response used as source of truth for local state update
- Error state shown on API failure; edit form NOT cleared on failure
- Loading/saving indicator in PetForm while API call in flight

Refs: GRO-1470
Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/portal/sections/PetForm.tsx

@@ -1,5 +1,5 @@
 import { useState } from "react";
-import { X, Save, Plus, Star } from "lucide-react";
+import { X, Save, Plus, Star, Loader2 } from "lucide-react";
 import type { Pet, MedicalAlert, CoatType, AlertSeverity } from "@groombook/types";
 
 const COAT_TYPES: CoatType[] = ["double", "wire", "curly", "smooth", "long", "hairless"];
@@ -9,15 +9,17 @@ type SizeOption = typeof SIZE_OPTIONS[number];
 
 interface Props {
   pet?: Pet;
-  onSave: (pet: Pet) => void;
+  onSave: (pet: Pet) => void | Promise<void>;
   onCancel: () => void;
+  saving?: boolean;
+  saveError?: string | null;
 }
 
 function newAlert(): Omit<MedicalAlert, "id"> {
   return { type: "", description: "", severity: "low" };
 }
 
-export function PetForm({ pet, onSave, onCancel }: Props) {
+export function PetForm({ pet, onSave, onCancel, saving, saveError }: Props) {
   const [name, setName] = useState(pet?.name ?? "");
   const [breed, setBreed] = useState(pet?.breed ?? "");
   const [weight, setWeight] = useState(pet?.weightKg ?? 0);
@@ -305,18 +307,23 @@ export function PetForm({ pet, onSave, onCancel }: Props) {
           <button
             type="button"
             onClick={onCancel}
-            className="flex-1 px-4 py-2 border border-stone-200 rounded-lg text-sm text-stone-600 hover:bg-stone-50"
+            disabled={saving}
+            className="flex-1 px-4 py-2 border border-stone-200 rounded-lg text-sm text-stone-600 hover:bg-stone-50 disabled:opacity-50"
           >
             Cancel
           </button>
           <button
             type="submit"
-            className="flex-1 flex items-center justify-center gap-1.5 px-4 py-2 bg-(--color-accent) text-white rounded-lg text-sm font-medium hover:bg-(--color-accent-hover)"
+            disabled={saving}
+            className="flex-1 flex items-center justify-center gap-1.5 px-4 py-2 bg-(--color-accent) text-white rounded-lg text-sm font-medium hover:bg-(--color-accent-hover) disabled:opacity-50"
           >
-            <Save size={14} />
-            Save
+            {saving ? <Loader2 size={14} className="animate-spin" /> : <Save size={14} />}
+            {saving ? "Saving…" : "Save"}
           </button>
         </div>
+        {saveError && (
+          <p className="text-sm text-red-500 text-center">{saveError}</p>
+        )}
       </form>
     </div>
   );

src/portal/sections/PetProfiles.tsx

@@ -83,9 +83,27 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
   const petHistory = appointments.appointments.filter(a => a.pet?.id === selectedPetId && new Date(a.startTime) <= new Date());
   const editingPet = editingPetId ? pets.find(p => p.id === editingPetId) ?? null : null;
 
-  function handlePetSave(updatedPet: Pet) {
-    setPets(prev => prev.map(p => p.id === updatedPet.id ? updatedPet : p));
-    setEditingPetId(null);
+  const [saving, setSaving] = useState(false);
+  const [saveError, setSaveError] = useState<string | null>(null);
+
+  async function handlePetSave(updatedPet: Pet) {
+    setSaving(true);
+    setSaveError(null);
+    try {
+      const res = await fetch(`/api/portal/pets/${updatedPet.id}`, {
+        method: "PATCH",
+        headers: { "Content-Type": "application/json", ...buildHeaders(sessionId) },
+        body: JSON.stringify(updatedPet),
+      });
+      if (!res.ok) throw new Error("Failed to save pet");
+      const saved: Pet = await res.json();
+      setPets(prev => prev.map(p => p.id === saved.id ? saved : p));
+      setEditingPetId(null);
+    } catch (e) {
+      setSaveError(e instanceof Error ? e.message : "Failed to save pet");
+    } finally {
+      setSaving(false);
+    }
   }
 
   if (editingPet) {
@@ -94,6 +112,8 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
         pet={editingPet}
         onSave={handlePetSave}
         onCancel={() => setEditingPetId(null)}
+        saving={saving}
+        saveError={saveError}
       />
     );
   }