- Add pauseProject() and resumeProject() methods to ProjectEngineManager
- Wire pause and resume routes to engineManager with proper error handling
- Update frontend useProjectActions hook to use dedicated pause/resume APIs
- Add comprehensive tests for pause/resume in ProjectEngineManager
- Add route tests for project pause/resume with engineManager mocks
- Fix mock stubs for getProject/updateProject/updateProjectHealth
- Extract view state, project actions, and task handler concerns from AppInner into dedicated hooks
- Add AppModals component to centralize modal rendering and related props wiring
- Inline thin aliases and complete AppInner cleanup after moving responsibilities out
- Add unit tests for useViewState, useProjectActions, and useTaskHandlers hooks