feat: implement Story 3.1 — chat panel UI with streaming AI responses

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Add AI copilot chat panel to the diagram editor with streaming responses,
chat history persistence, and markdown rendering. Includes copilot API route,
diagram-aware system prompt, and schema with 15 passing tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Alejandro Gutiérrez

2026-02-28 10:03:43 +00:00

parent 9d13d0f562

commit 26215d9060

20 changed files with 3223 additions and 37 deletions

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