* fix: migrate middleware.ts to proxy.ts for Next.js 16 (#88)
Next.js 16 deprecated the `middleware` file convention in favor of
`proxy`. The proxy runs on the Node.js runtime instead of Edge, so
safeCompare now uses crypto.timingSafeEqual instead of manual XOR.
All auth logic, CSRF validation, host matching, and security headers
are preserved unchanged.
* feat: add "Update Available" banner with GitHub release check
Add a dismissible emerald banner that appears when a newer GitHub release
exists, so self-hosting users know an update is available. The banner
dismisses per-version (reappears for new releases).
- Create src/lib/version.ts as single source of truth from package.json
- Add /api/releases/check route with 1hr caching and graceful fallback
- Add UpdateBanner component mirroring LocalModeBanner pattern
- Add update state to Zustand store with localStorage persistence
- Fix hardcoded v2.0 in header-bar.tsx and 2.0.0 in websocket.ts
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