Add L1 invariant tests for all Screen Models:
- DashboardDetailModel: test load, delete, pagination, column filter
- DashboardHubModel: test load, environment switching, selection, git actions
- DatasetDetailModel: test load, edit, delete
- DatasetsHubModel: test load, filter, pagination
- DictionaryDetailModel: test load entries, add, edit, delete, search
- LLMReportModel: test load, filter, report generation
- TranslateHistoryModel: test load runs, filter, pagination
- ValidationRunDetailModel: test load details, records
- ValidationTasksListModel: test load tasks, status transitions
Per semantics-testing protocol: L1 tests verify model invariants without
DOM rendering.
busya
41a3a41ec4