The EE-frontend removal (a88b3f77) deleted enable-ai-chat.tsx, the only UI
that set the workspace flag settings.ai.chat. The backend gates remained:
the header assistant icon (page-header-menu) and the /ai-chat/stream endpoint
both require settings.ai.chat === true, and the flag is auto-enabled only in
cloud mode. As a result, self-hosted community builds could configure an AI
provider but had no way to turn the chat on, so the assistant icon never
appeared.
Restore a single admin toggle wired to the already-existing backend `aiChat`
field, modeled on the adjacent MCP settings switch:
- add aiChat?: boolean to the client IWorkspace type
- add AiChatSettings component (optimistic update, revert-on-error,
workspaceAtom sync so the icon updates without reload)
- render it (admin-only) in workspace settings between AI / Models and
AI / External tools (MCP)
Generative AI and AI search toggles, removed in the same commit, are left
out of scope.
060c14cc27