Fix QA feedback: type imports, query methods, implicit any, null guards, accessibility

- Import Pet/MedicalAlert/CoatType/AlertSeverity from @groombook/types (workspace dep)
- Replace getByPlaceholder with getByPlaceholderText in test file
- Add explicit MedicalAlert type to destructured alert param in PetForm
- Add null guards for HTMLElement | undefined in test lines 79/111
- Add htmlFor=coat-type label association for accessible combobox

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

src/portal/sections/PetProfiles.tsx

@@ -1,7 +1,7 @@
 import { useState, useEffect } from "react";
 import { PawPrint, Heart, Scissors, Clock, Edit3, Loader2, Star, X } from "lucide-react";
 import { PetForm } from "./PetForm.js";
-import type { Pet } from "../../../../packages/types/src/index.js";
+import type { Pet } from "@groombook/types";
 
 interface Appointment {
   id: string;