feat: rewrite with hono and alpine - #143

Rewrites the index from Next.js 12 to Hono + Alpine.js. One codebase runs on Cloudflare Workers, Vercel and any Node host, with no client bundle.

Features

• Folder browsing with breadcrumbs, back/forward and deep links
• Instant filter in the current folder, Enter searches the whole Dropbox
• Sort by name, size or date with natural ordering
• Preview images, video, audio, Markdown and text files, step through with ← →
• Folder README.md rendered below the listing
• Permanent share links (/api/dl/* redirects to a fresh temporary link)
• Optional HTTP Basic auth (AUTH_USER / AUTH_PASS)
• Empty, error and loading states; light/dark theme; mobile layout; Lucide icons

Under the hood

• Dropbox API via plain fetch (no SDK); errors keep their real HTTP status
• Access token cached per instance with a single in-flight refresh, shared through the Cache API where available
• Listing/search/preview responses cached for 60s via hono/cache (no-op on Node)
• Markdown sanitized with DOMPurify; raw file content served as text/plain with nosniff
• Tooling: Vite+ (vp dev, vp check, vp build), pnpm, CI runs vp check

Deploy

• Cloudflare Workers: Deploy to Cloudflare button (wrangler.toml, secrets from .env.example)
• Vercel: zero-config Hono
• Node: pnpm vp build && pnpm start

Breaking changes

• NEXT_PUBLIC_TITLE is now TITLE
• .env.sample is now .env.example
• Render config removed (any Node host still works)
• Requires Node 22.18+ and pnpm

Closes #24, closes #89, closes #126, closes #129