Add visualizations to chat

**What the feature is (as Title)**
Add visualization to chat

**Value proposition**
Pull any dashboard visualization into the AI chat as context with one click, so users can ask questions about a specific chart — what caused the spike, how it compares to last week — without re-describing the query or exporting a screenshot. The chat answers against the actual underlying data, not a guess at what the panel shows.

**Expected outcome**
Faster investigation from chart to root cause, higher engagement with the AI chat by giving it an obvious entry point from where users already work, and fewer abandoned questions that stall because the context was too tedious to explain.

**Optional: Key user stories / use cases**

The issue names no files, tests, or entry points. First locate the dashboard visualization and AI chat entry points, then clarify how a chart’s underlying data is passed as context and what one-click behavior and answer validation constitute done.

Written by the indexing model from the issue text.