Say so when the Planner is unavailable

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

C5MAMaggie Appleton and Claude Opus 5.5 authored last month

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apps/web/src/chat/chat.tsx+17 −1

apps/web/src/chat/references.test.ts+22 −0

apps/web/src/chat/references.ts+17 −0

e2e/chat-mentions.e2e.ts+19 −0