Migrate website to Next.js and Cloudflare Workers

[adaliea]

Replace the Jekyll runtime with Next.js 16, React 19, TypeScript 7, and Tailwind 4, configured for Cloudflare Workers through OpenNext. Preserve the photo backdrop, handwritten typography, colors, and original blog content.

• Overlay navigation directly on the homepage photo, aligned beside “Hey there!” without repeating the site name or reserving a separate row. Use a keyboard-accessible hamburger menu on mobile/tablet and inline links on desktop; retain the standard header on inner pages.
• Render the reading log and homepage book/music activity on the server. Book covers arrive with explicit width/height attributes and stable aspect-ratio boxes; search, filters, retry states, and existing editor callbacks remain interactive.
• Compile the unchanged _posts Markdown at build time. Preserve every original blog URL, heading anchor, handwritten note, Atom feed ID, and Giscus discussion title. Adapt note cleanup for client navigation and constrain rotated notes on narrow screens.
• Preserve project content, redirect shortcuts, template storage, and the Scratch game. Self-host fonts and replace the Ruby build/CI workflow with Node, Biome, and Workers checks.

Validation: clean dependency install, lint, typecheck, four content/template tests, production OpenNext build, 14 desktop/mobile browser tests against Node and 14 against the Workers runtime, and Wrangler deployment dry run. Browser checks cover all existing blog URLs, 320px note layouts, mobile menu keyboard behavior, API failures, editor parameters, and book content with JavaScript disabled. npm audit reports no vulnerabilities; _posts has no changes.

Deployment commands and configuration are documented in the README. The Worker name defaults to adalie-website; set it to an existing Worker name if needed and attach the custom domain in Cloudflare. This PR does not deploy to production.

[cloudflare-workers-and-pages]

Deploying adaliea-github-io with    Cloudflare Pages

Latest commit:	877a10a
Status:	🚫  Build failed.

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