Arnaud
c5a8f94b26
The general assistant had exactly one conversation per user forever (recipeId null on chat_messages) — no way to start fresh or organize by topic. Adds an ai_conversations table (title, timestamps) and a nullable conversationId FK on chat_messages; the assistant panel gets a conversations menu to create/switch/rename/delete, auto-titling a new conversation from its first question. Per-recipe chat is untouched — each recipe already has one natural thread, so multi-conversation support only applies to the homepage assistant. Pre-existing general messages (no conversationId) aren't migrated into the new model and won't appear in the conversation list. Requires migration 0042 to run against a live DB — not applied in this sandbox (no Docker here); run `pnpm db:migrate`. v0.43.0