feat: add newsletter signup section to homepage

[Krishan27]

Summary

• Adds a "Stay in the loop" section above the footer on the main homepage
• Email input + Subscribe button POSTs to Loops newsletter form API (cmpeyyijd02t40jud6lemhuu0)
• JavaScript fetch() handles submission with no page reload — shows "You're in. Talk soon." on success, error message on failure
• Fully styled to match the existing dark/light theme system
• Accessible: aria-live on the message element, aria-label on the input, novalidate with custom validation

Test plan

• Visit homepage, enter a valid email, click Subscribe — verify success message appears and contact appears in Loops Audience
• Submit with invalid email — browser native validation blocks it
• Submit twice — verify second submit shows appropriate message
• Toggle light/dark theme — verify section styles correctly in both modes
• Mobile (<680px) — verify input and button stack/wrap correctly

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: be7932cf-c58b-4161-8c74-4c76ddcaf7a3

📥 Commits

Reviewing files that changed from the base of the PR and between 0df1df6 and 2780907.

📒 Files selected for processing (1)

• src/pages/index.astro

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/newsletter-homepage-signup

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