Adds a narrow IDataManager contract covering the 5 DataManager members
referenced from ui/screens/** (currentUser, residences, totalSummary,
featureBenefits, subscription) and a staticCompositionLocalOf ambient
(LocalDataManager) that defaults to the DataManager singleton.
No screen call-sites change in this commit — screens migrate in P0.2.
ViewModels, APILayer, and PersistenceManager continue to depend on the
concrete DataManager singleton directly; the interface is deliberately
scoped to the screen surface the parity-gallery needs to substitute.
Includes IDataManagerTest (DataManager is IDataManager) and
LocalDataManagerTest (ambient val is exposed + default type-checks to the
real singleton). runComposeUiTest intentionally avoided — consistent with
ThemeSelectionScreenTest's convention, since commonTest composition
runtime is flaky on iosSimulator.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
98b775d335