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gsxdsm 7960789d37 FN-6167: fix stale mobile modal navigation history

Keep modal history entries in sync so mobile swipe-back reliably closes reopened task detail views.

- add removeNav support to navigation history and ignore self-triggered popstate callbacks
- route modal and overlay programmatic close handlers through navigation-aware wrappers
- add regression coverage for close-and-reopen mobile detail flows and document the stale stack bug

Files changed:
 .../navigation-history-stale-modal-stack.md        |  85 +++++++++++++
 packages/dashboard/app/App.tsx                     |  35 ++++--
 packages/dashboard/app/components/AppModals.tsx    | 137 +++++++++++++++++----
 .../app/components/__tests__/AppModals.test.tsx    |   5 +-
 .../__tests__/navigation-history.test.tsx          | 113 ++++++++++++++++-
 .../hooks/__tests__/useNavigationHistory.test.ts   |  98 +++++++++++++++
 .../dashboard/app/hooks/useNavigationHistory.ts    |  55 ++++++++-
 7 files changed, 494 insertions(+), 34 deletions(-)

Fusion-Task-Id: FN-6167

Fusion-Task-Lineage: 086d60ba-7e3d-4e83-b9b4-37ec49b06393

2026-06-09 22:44:30 -07:00