* feat(app): open summarized tool calls in mobile sheets
Keep compact timelines readable by moving summarized tool-call groups into a live sheet while preserving the existing inline desktop interaction. Individual calls reuse the current detail sheet and stack above the group.
* fix(app): keep mobile tool call sheets current
Restore live group-sheet auto-follow, replace the mocked component coverage with real compact and desktop browser journeys, and remove the touched theme subscriptions.
