Implement functional footer email subscription flow with accessible status feedback

[Copilot]

The footer “Stay Updated” subscription UI existed but did not submit anywhere. This PR wires it into the existing Formspree flow so subscriptions are actually sent and users get clear submission feedback.

• Subscription flow implementation

  • Converted the footer subscription block into a real form submit path.
  • Added submit handler in Footer.jsx that posts form data to Formspree (/f/xovqarqp), matching the existing contact integration pattern.
  • Added name="email" and required so the email field is valid payload and browser-validated.

• User-visible behavior

  • On successful submit: shows confirmation message and resets the input.
  • On failure: shows a clear retry message.

• Accessibility

  • Added semantic announcement roles for async feedback:
    • success message uses role="status"
    • error message uses role="alert"

<SubscribeContainer as="form" ref={subscriptionFormRef} onSubmit={handleSubscription}>
  <input type="email" name="email" placeholder="Enter your email" required />
  <button type="submit">Subscribe</button>
</SubscribeContainer>

{subscriptionStatus === "SUCCESS" && <p role="status">Thanks for subscribing!</p>}
{subscriptionStatus === "ERROR" && <p role="alert">Subscription failed. Please try again.</p>}

• Screenshot
  • 

Original prompt

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This section details on the original issue you should resolve

<issue_title>Check if email subscription actually works</issue_title>
<issue_description>Check if the feature of email subscription works properly. I think its not 100% implemented. I want you to have a look on it and finish it ASAP!

Thank you </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Check if email subscription actually works #23

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[Yasar2019]

Good

[github-actions]

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