Break down the monolithic BackgroundTasks component into smaller, highly cohesive modules to improve maintainability and readability.
- Extract complex UI components into dedicated files (`BackgroundTaskSummary`, `ExpandedTaskPanel`, `TaskStagePill`, `TaskProgressBar`, `BackgroundTaskActions`, and `FailedWorkerItemRow`).
- Move task construction, duplicate scan formatting, and progress calculation logic into a dedicated `taskModel.ts` utility file.
- Relocate shared interfaces and constants to `types.ts` to cleanly decouple data structures from the presentation layer.
LyAhn
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