feat(01-03): auto-capitalize first letter of pet name on input

src/components/pet/PetForm.tsx

@@ -196,6 +196,11 @@ export function PetForm({
           placeholder="Enter pet name"
           aria-invalid={!!errors.name}
           {...register("name")}
+          onChange={(e) => {
+            const v = e.target.value;
+            e.target.value = v ? v[0].toUpperCase() + v.slice(1) : v;
+            void register("name").onChange(e);
+          }}
         />
         {errors.name && (
           <p className="text-xs text-destructive">{errors.name.message}</p>