- Make Workflow tab always visible in TaskDetailModal (not conditional on enabled steps)
- Add summary bar showing pass/fail/skip counts with color-coded badges
- Make workflow step output collapsible with expand/collapse toggle
- Add enhanced empty states for no steps configured, all skipped, and no results
- Add CSS styles for summary bar, collapsible output, and empty state variants
- Update TaskDetailModal tests to reflect always-visible Workflow tab
- Add comprehensive tests for WorkflowResultsTab new features