Use ::placeholder for Input Styling

Use ::placeholder for input placeholder styling, not wrapper elements.

Incorrect (custom placeholder node):

<div className={styles.inputWrapper}>
  {!value && <span className={styles.placeholder}>Enter text...</span>}
  <input value={value} />
</div>

Correct (native ::placeholder):

input::placeholder {
  color: var(--gray-9);
  opacity: 1;
}