fix(GRO-1369): add missing sizeCategory/coatType/bufferMinutes to @groombook/types

Pet interface: added sizeCategory and coatType (nullable strings).
Service interface: added defaultBufferMinutes.
Appointment interface: added bufferMinutes.

These fields are referenced by Book.tsx, cascade.ts, buffer.ts, appointment
routes, and other type-annotated consuming code. Without them, any file that
imports these interfaces and accesses the fields causes a TypeScript error.

cc @cpfarhood

Co-Authored-By: Flea Flicker <noreply@paperclip.ing>

packages/types/src/index.ts

@@ -32,6 +32,8 @@ export interface Pet {
   name: string;
   species: string;
   breed: string | null;
+  sizeCategory: string | null;
+  coatType: string | null;
   weightKg: number | null;
   dateOfBirth: string | null;
   healthAlerts: string | null;
@@ -64,6 +66,7 @@ export interface Service {
   description: string | null;
   basePriceCents: number;
   durationMinutes: number;
+  defaultBufferMinutes: number;
   active: boolean;
   createdAt: string;
   updatedAt: string;
@@ -114,6 +117,7 @@ export interface Appointment {
   cancelledAt: string | null;
   confirmationToken: string | null;
   customerNotes: string | null;
+  bufferMinutes: number;
   createdAt: string;
   updatedAt: string;
 }