Fix QA review 2719: optional coatType/petSizeCategory, CoatType union, null guards

- Make coatType and petSizeCategory optional on Pet (?:) — they may not be set
- Remove "single" and "short" from COAT_TYPES (not in CoatType union)
- Use { name: "Add" } instead of /add/i to target the + button specifically
- Add optional chaining to puppyCutSpans[0]?.closest() (noUncheckedIndexedAccess)
- Add optional chaining to petsData[0]?.id ?? "" in PetProfiles

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/portal/sections/PetForm.tsx

@@ -2,7 +2,7 @@ import { useState } from "react";
 import { X, Save, Plus, Star } from "lucide-react";
 import type { Pet, MedicalAlert, CoatType, AlertSeverity } from "@groombook/types";
 
-const COAT_TYPES: CoatType[] = ["double", "single", "wire", "curly", "smooth", "long", "short", "hairless"];
+const COAT_TYPES: CoatType[] = ["double", "wire", "curly", "smooth", "long", "hairless"];
 const SEVERITY_OPTIONS: AlertSeverity[] = ["low", "medium", "high"];
 
 interface Props {

src/portal/sections/PetProfiles.tsx

@@ -67,7 +67,7 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
         setAppointments(apptsData);
 
         if (petsData.length > 0 && !selectedPetId) {
-          setSelectedPetId(petsData[0].id);
+          setSelectedPetId(petsData[0]?.id ?? "");
         }
       } catch (e) {
         setError(e instanceof Error ? e.message : "Failed to load data");