/iblai-vibe-history

Add the user profile History surface -- "Review and export your conversations with AI agents." A user's own chat history across every agent, in two tabs: Conversations (agent / date-range / sentiment / topic filters, a two-column conversation list + transcript preview, per-conversation CSV download, and a filtered Export) and Exports (previously generated reports with status, the filters used, expiry, and a re-download action). Everything rides the user-scoped my-chat-history* endpoints. The backend serves a user's sessions to the user themselves, tenant admins, and watchers of that user — so the tab renders on your own profile, and on someone else's profile (opened from the Management tab) only for admin/watcher viewers; any other caller gets a 403.

This is the user-facing counterpart of /iblai-vibe-agent-history (the admin History tab in agent settings, which shows every user's conversations for one agent).