fix(GRO-1793): remove unused act import and add aria-label to date inputs

QA review pointed out:
- Lint error: 'act' imported but never used in test file
- 6 test failures: date input lacked accessible label

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

src/__tests__/Appointments.test.tsx

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
-import { render, screen, fireEvent, waitFor, act } from "@testing-library/react";
+import { render, screen, fireEvent, waitFor } from "@testing-library/react";
 import { parseTimeTo24Hour, isUpcoming, CustomerNotesSection, ConfirmationSection } from "../portal/sections/Appointments.tsx";
 
 const UPCOMING_APPT = {