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Fusion Agent b2125aeb2d FN-104: preserve update restart state

Preserve a pending update across Settings reopen while coordinating installation and restart behavior.

- Add pending-update install state and coordinator flows across dashboard and system controls.
- Expose health/settings update APIs and retain restart state through modal reopen.
- Cover desktop/mobile UX, route behavior, coordinator logic, and document the update flow.

Files changed:
 .changeset/fn-104-pending-update-restart.md        |   7 ++
 docs/architecture.md                               |   3 +
 docs/assets/fn-104-pending-update-desktop.png      | Bin 0 -> 10926 bytes
 docs/assets/fn-104-pending-update-mobile.png       | Bin 0 -> 6101 bytes
 docs/dashboard-guide.md                            |   2 +-
 docs/settings-reference.md                         |   2 +-
 packages/core/src/task-store/task-creation.ts      |   1 -
 packages/dashboard/app/api/client/health.ts        |  12 ++++
 packages/dashboard/app/api/settings/settings.ts    |   3 +
 .../dashboard/app/components/SettingsModal.tsx     |  46 ++++++++-----
 .../app/components/UpdateAvailableBanner.tsx       |  20 ++++--
 .../__tests__/SettingsModal.general.test.tsx       |   6 ++
 .../__tests__/SettingsModal.models-auth.test.tsx   |  72 +++++++++++++++++++
 .../__tests__/UpdateAvailableBanner.test.tsx       |   2 +
 .../components/__tests__/settings-mobile.test.tsx  |   3 +
 .../command-center/areas/SystemControlsArea.tsx    |  18 +++--
 .../__tests__/usePendingUpdateInstall.test.ts      |  44 ++++++++++++
 .../dashboard/app/hooks/usePendingUpdateInstall.ts |  76 +++++++++++++++++++++
 packages/dashboard/app/hooks/useUpdateCheck.ts     |   8 +++
 .../dashboard/src/__tests__/auto-update.test.ts    |  18 +++++
 .../__tests__/update-install-coordinator.test.ts   |  36 ++++++++++
 packages/dashboard/src/auto-update.ts              |  14 +++-
 .../__tests__/register-update-check-routes.test.ts |  14 ++++
 .../src/routes/register-update-check-routes.ts     |  31 ++++++++-
 .../dashboard/src/update-install-coordinator.ts    |  23 +++++++
 25 files changed, 425 insertions(+), 36 deletions(-)

Fusion-Task-Id: FN-104
Fusion-Task-Lineage: c754b258-654d-4efe-9b12-1addc7ed190b
Co-authored-by: Fusion <noreply@runfusion.ai>

2026-08-21 14:41:37 +00:00