Jean-Luc Makiola
9f902ff2c7
feat(06-01): build task history sheet, wire into TaskFormScreen, add CalendarTaskRow navigation
- Create task_history_sheet.dart: showTaskHistorySheet() modal bottom sheet
- Sheet uses StreamBuilder on watchCompletionsForTask, shows dates in dd.MM.yyyy + HH:mm format
- Empty state: Icons.history + 'Noch nie erledigt' message
- Count summary shown above list when completions exist
- Add Verlauf ListTile to TaskFormScreen (edit mode only) opening history sheet
- Add onTap to CalendarTaskRow navigating to /rooms/:roomId/tasks/:taskId
- All 106 tests pass, zero analyze issues