Update group filtering logic in `ClazzDetailViewModel.kt` to handle null timestamps and ensure distinct groups are correctly mapped from xAPI statements.
(details / githubweb)
Remove `XapiStatementExt.kt` and inline xAPI agent and statement creation logic within `StudentGroupingDetailViewModel` and `StudentGroupingEditViewModel`. Use `xapiAgent` directly from the selected account session and manually construct `XapiStatement` and `XapiAgent` objects for group management and voiding operations.
(details / githubweb)
Remove unnecessary empty lines in `ClazzDetailViewModel.kt`.
(details / githubweb)
Apply minor formatting and whitespace adjustments to `ClazzDetailViewModel.kt`.
(details / githubweb)
Improve error handling and data robustness in student grouping view models and screens.
(details / githubweb)
