Fix the bug where tasks created during onboarding don't appear on
the Residence Detail screen until app restart. Root cause:
DataManager.updateTask is a no-op when both _allTasks is null AND
_tasksByResidence[residenceId] is empty — the case after a fresh
register-then-bulk-create flow.
Approach: collapse the dual cache into a single source of truth
(_allTasks). Residence detail observes it directly and filters by
residenceId in-memory. After mutations, force-refresh _allTasks from
the server (one round-trip eliminates a class of bugs).
Plan covers 14 tasks across 4 phases plus a regression XCUITest
that captures the user-visible bug end-to-end.
Trey t
65803a2180