Lukas Moschitz f3d01b83c7 fix(showcase): align langgraph-fastapi frontend chrome with langgraph-python ...

Task 1 of OSS-582 (frontend parity). Bring the app chrome + beautiful-chat
byte-identical to the langgraph-python north star:
- globals.css: adopt LGP theme (@theme inline tokens + green palette)
- middleware.ts: add (was missing) — sets x-pathname like LGP
- layout.tsx: adopt LGP structure; keep FastAPI in title/log (identity carve-out)
- beautiful-chat/page.tsx: sync stale doc comment

Also fix a Dockerfile parity gap: fastapi was missing the COPY manifest.yaml
that LGP has. demos/layout.tsx reads manifest.yaml at request time via
generateMetadata (headers() -> dynamic), so without it every /demos/* route
crashed with an RSC render error (ENOENT /app/manifest.yaml).

2026-07-23 16:26:52 +02:00

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