- Enrich TaskTokenStatsPanel with timing extraction, workflow runtime summaries, and longest-event highlights from task logs and workflow results
- Add an execution details section for mode, runtime status, step progress, retries, recovery state, and runtime links
- Wire TaskDetailModal to pass the working task into the stats panel so the Stats tab renders execution context with token usage
- Extend TaskDetailModal and TaskTokenStatsPanel tests (plus panel CSS) to cover the new stats sections and loading/empty/token states
