[lbarrosby]

The slides and workshop pages open their WebSocket with:

const serverBaseUrl = process.env.SERVER_BASE_URL || 'http://localhost:8001';
const wsBaseUrl = serverBaseUrl.replace(/^http/, 'ws') ? serverBaseUrl.replace(/^https/, 'wss') : ...;

SERVER_BASE_URL is not a NEXT_PUBLIC_ variable, so in the browser this is always http://localhost:8001, and the ternary is always truthy, so an http base never becomes ws. On any deployment not opened from localhost these pages try the viewer's own machine, wait for the timeout and only then fall back to /api/chat/stream. Behind a reverse proxy they also ignore NEXT_PUBLIC_WS_BASE_URL.

Chat and codemap already solved this in src/utils/websocketClient.ts. This exports getWebSocketUrl() from there and uses it in both pages, so all WebSocket callers resolve the URL the same way (page host + NEXT_PUBLIC_API_PORT, or NEXT_PUBLIC_WS_BASE_URL).

Refs #389

Tested: tsc --noEmit passes. node -e with the old expression gives http://localhost:8001/ws/chat for the default value.