Add native data view charts

[SudoJacky]

Summary

• add a native publish_data_view agent tool with strict Data View v1 validation
• persist and replay data view artifacts through thread history
• render interactive ECharts cards with chart, table, CSV, and provenance views
• support multiple data view publications in a single provider response
• prevent chart cards from shrinking in the conversation and keep drawer details readable

Why

Agents previously could only describe analytical results in text. This adds a native, persisted visualization path for the app chat experience.

The layout regression had two root causes: conversation grid rows were allowed to shrink, and a broad drawer flex selector also matched artifact content. The fix gives conversation rows intrinsic height and scopes the drawer header layout while making its content independently scrollable.

Validation

• cargo test -j4 data_view
• cargo check -j4
• cargo fmt --all -- --check
• 140 relevant frontend tests
• npm run build
• git diff --check

[chatgpt-codex-connector]

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