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gsxdsm e46ea00ff5 FN-6827: add engine status banner

Add project-scoped engine connectivity remediation to the dashboard.

- Add engine status/start API helpers and server routes that can resume paused projects or start missing engines.
- Render a project banner with dashboard-only guidance, polling, disabled starting state, localized copy, and focused tests.
- Document the engine status banner behavior and add a changeset for the published CLI package.

Files changed:
 .changeset/fn-6827-engine-disconnected-banner.md   |   7 +
 docs/dashboard-guide.md                            |   8 +
 packages/dashboard/app/api/legacy.ts               |  20 +++
 .../app/components/EngineStatusBanner.css          |  87 +++++++++++
 .../app/components/EngineStatusBanner.tsx          |  62 ++++++++
 .../__tests__/EngineStatusBanner.test.tsx          | 145 +++++++++++++++++
 .../app/components/dashboard/DashboardBanners.tsx  |   3 +
 .../app/hooks/__tests__/useEngineStatus.test.ts    | 171 +++++++++++++++++++++
 packages/dashboard/app/hooks/useEngineStatus.ts    | 111 +++++++++++++
 packages/dashboard/src/__tests__/server.test.ts    | 129 ++++++++++++++++
 packages/dashboard/src/server.ts                   |  89 +++++++++++
 packages/i18n/locales/en/app.json                  |  10 ++
 packages/i18n/locales/es/app.json                  |  10 ++
 packages/i18n/locales/fr/app.json                  |  10 ++
 packages/i18n/locales/ko/app.json                  |  10 ++
 packages/i18n/locales/zh-CN/app.json               |  10 ++
 packages/i18n/locales/zh-TW/app.json               |  10 ++
 17 files changed, 892 insertions(+)

Fusion-Task-Id: FN-6827

Fusion-Task-Lineage: 56821ca3-04c8-4674-9400-3639f10e463d

2026-06-25 08:35:44 -07:00