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gsxdsm a411b8a7e0 FN-5914: fix mission activity counts and chronology

Keep mission activity counts accurate before event data loads and show events in chronological order.

- add persisted mission event counts to core mission summaries and dashboard mission summary types
- use the summary event count for the Activity tab preload badge instead of the currently loaded page total
- render mission activity oldest-to-newest, keep load-more prepends stable, and scroll to the latest event on initial/live updates
- extend mission store, dashboard, and MissionManager tests for event count and ordering coverage

Files changed:
 packages/core/src/__tests__/mission-store.test.ts  |  19 ++++
 packages/core/src/mission-store.ts                 |  24 ++++-
 packages/dashboard/app/api/legacy.ts               |   2 +
 .../dashboard/app/components/MissionManager.tsx    |  19 ++--
 .../components/__tests__/MissionManager.test.tsx   | 107 ++++++++++++++++-----
 packages/dashboard/app/components/mission-types.ts |   1 +
 .../dashboard/src/__tests__/mission-e2e.test.ts    |   7 +-
 7 files changed, 143 insertions(+), 36 deletions(-)

Fusion-Task-Id: FN-5914

Fusion-Task-Lineage: b3119e94-66bd-437d-bcde-d5e4e43cb29e

2026-06-02 19:28:01 -07:00