Adds a status ComboBox in the Details header (no transition guards)
and a Tags section with chips + AutoCompleteBox. TaskRowViewModel.Tags
becomes an ObservableCollection so chip lists stay live. TasksIsland
caches AllTags for the row context menu and exposes Set/Toggle helpers.
Test fakes updated for the new IWorkerClient methods.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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