feat: add mobile app and job UI fixes

[Ramlaoui]

Summary

• add the Expo/React Native mobile app for jobs, launch, watchers, settings, live streams, notifications, and session persistence
• improve job output handling for missing output paths, running-output cache refresh throttling/configuration, and SSH ControlMaster failure backoff/process cleanup
• improve web UI job/watchers surfaces with host filters, partition resource display, dark-theme fixes, safer right-click/outside-click handling, and opaque script-error handling

Tests

• uv run --no-sync pytest tests/unit/test_job_data_manager.py tests/unit/test_ssh_backend.py tests/unit/test_web_job_output.py tests/unit/test_watcher_actions.py
• npm run check in web-frontend/
• npm run typecheck in mobile-app/
• npm test -- --runInBand in mobile-app/

Notes

• Excluded local/non-feature files from the PR: .codex, .swift-version, LICENSE.txt, and test-results/.