Add Coming Soon banner, waitlist page, and waitlist API

[aliamerj]

Motivation

• Add a high-visibility “Coming Soon” announcement and a conversion-focused page to collect early interest (email + thoughts) for the dcup launch.
• Surface the waitlist CTA everywhere (top banner, navbar entries) so visitors can easily join the list.
• Provide a minimal server-side capture endpoint so submissions are validated and available for integration with mailing/list systems.

Description

• Inserted a full-width announcement banner that links to /coming-soon and added join CTA entries in the navbar for both mobile and desktop (updated components/Navbar/Navbar.tsx).
• Added a new, attractive waitlist page at app/(home)/coming-soon/page.tsx with the requested title/description, lead copy, feature bullets, and a form that collects email and thoughts with client-side submit state (loading/success/error).
• Implemented POST /api/waitlist at app/api/waitlist/route.ts with basic validation for required fields, email format, and minimum thoughts length, and server-side logging for captured submissions.
• Polish and supportive changes: added keyframe animations (fadeSlideIn, floatIn) in app/global.css, refined blog and docs layouts for consistency, and updated app/(home)/page.tsx and other UI pieces to match the refreshed visual language.

Testing

• Ran npm run build which completed successfully and listed the new /coming-soon and /api/waitlist routes in the build output.
• Launched the dev server with npm run dev and verified the homepage and /coming-soon rendered without errors.
• Captured automated Playwright screenshots of the homepage banner and the new coming-soon page which were produced as artifacts (succeeding).

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Codex Task

[netlify]

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