Add accessible name to hero chat send button

[Copilot]

The linked review comment flagged an icon-only send control in HeroChat as missing an accessible name. This change applies that suggestion directly and limits scope to that single control.

• Accessibility: icon-only submit control

  • Added an explicit accessible name to the send button in components/hero-chat.tsx so assistive technologies can announce its purpose.

• Scope

  • No functional or visual behavior changes.
  • No unrelated review comments or files were modified.

<button
  type="button"
  onClick={() => void handleSubmit()}
  disabled={!message.trim() || submitted}
  aria-label="Send message"
  className="ml-auto inline-flex h-9 w-9 items-center justify-center rounded-full bg-[#10B981] text-white transition-all hover:bg-[#059669] disabled:cursor-not-allowed disabled:opacity-40"
>

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