FN-6656: add live activity trend charts
Add live Command Center activity line charts with safe animated rendering.
- Replace activity sparklines with reusable SVG line charts for messages, agents, nodes, and throughput trends.
- Refresh activity analytics on a bounded interval while preserving existing data during revalidation.
- Add zero/NaN-safe chart geometry, reduced-motion styling, tests, docs, and a patch changeset.
Files changed:
.../fn-6656-command-center-activity-line-charts.md | 5 +
docs/dashboard-guide.md | 2 +-
.../command-center/__tests__/charts.test.tsx | 41 ++++++++
.../command-center/areas/ActivityArea.tsx | 62 ++++++++---
.../command-center/areas/__tests__/areas.test.tsx | 115 ++++++++++++++++++++-
.../components/command-center/charts/LineChart.tsx | 108 +++++++++++++++++++
.../components/command-center/charts/charts.css | 62 +++++++++++
7 files changed, 381 insertions(+), 14 deletions(-)
Fusion-Task-Id: FN-6656
Fusion-Task-Lineage: 301de13a-91c0-425d-b743-8688fed48d41
662a09b631