feat: add accessible required field indicators and alerts

- Add visual asterisk for required inputs in Input.tsx
- Add .required style in Input.module.css
- Update Contact form to use required props and noValidate
- Add role="alert" to Contact form success/error messages
- Add tests for required field rendering

Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>

src/components/ui/Input.module.css

@@ -10,6 +10,11 @@
   color: var(--md-sys-color-on-surface);
 }
 
+.required {
+  color: var(--md-sys-color-error);
+  margin-left: 0.25rem;
+}
+
 .input {
   padding: var(--space-md);
   font-family: var(--md-sys-typescale-body-font);

src/components/ui/Input.tsx

@@ -15,6 +15,11 @@ export const Input = forwardRef<HTMLInputElement, InputProps>(
       <div className={`${styles.field} ${error ? styles.hasError : ''} ${className || ''}`}>
         <label htmlFor={inputId} className={styles.label}>
           {label}
+          {props.required && (
+            <span className={styles.required} aria-hidden="true">
+              *
+            </span>
+          )}
         </label>
         <input
           ref={ref}
@@ -46,6 +51,11 @@ export const Textarea = forwardRef<HTMLTextAreaElement, TextareaProps>(
       <div className={`${styles.field} ${error ? styles.hasError : ''} ${className || ''}`}>
         <label htmlFor={inputId} className={styles.label}>
           {label}
+          {props.required && (
+            <span className={styles.required} aria-hidden="true">
+              *
+            </span>
+          )}
         </label>
         <textarea
           ref={ref}

src/components/ui/__tests__/Input.test.tsx

@@ -32,6 +32,19 @@ describe('Input', () => {
     expect(input.getAttribute('aria-invalid')).toBe('false');
     expect(input.hasAttribute('aria-describedby')).toBe(false);
   });
+
+  it('renders required asterisk when required prop is passed', () => {
+    render(<Input label="Required Input" required />);
+
+    // We search for the asterisk specifically
+    // Note: getByText('*') matches the content of the span
+    const asterisk = screen.getByText('*');
+    expect(asterisk).toBeTruthy();
+    expect(asterisk.getAttribute('aria-hidden')).toBe('true');
+
+    const input = screen.getByRole('textbox', { name: /Required Input/i });
+    expect(input.hasAttribute('required')).toBe(true);
+  });
 });
 
 describe('Textarea', () => {
@@ -49,4 +62,15 @@ describe('Textarea', () => {
     expect(error.id).toBeDefined();
     expect(error.id).not.toBe('');
   });
+
+  it('renders required asterisk when required prop is passed', () => {
+    render(<Textarea label="Required Textarea" required />);
+
+    const asterisk = screen.getByText('*');
+    expect(asterisk).toBeTruthy();
+    expect(asterisk.getAttribute('aria-hidden')).toBe('true');
+
+    const textarea = screen.getByRole('textbox', { name: /Required Textarea/i });
+    expect(textarea.hasAttribute('required')).toBe(true);
+  });
 });