Changes

Add guideline on understanding code before committing

Added guideline about understanding and explaining code before committing.
 (commit: 07731c3)

Clarify variable usage in coding guidelines

Added guideline to avoid using two variables for the same purpose.
 (commit: 18b1fed)

Introduce `XapiStatementExt.kt` to centralize xAPI helper functions and refactor student grouping ViewModels.
 (commit: a93d8f5)

Remove unused `SchoolDataSource` import in `XapiStatementExt.kt`.
 (commit: a47996d)

Update AGENTS.md to refer to CODING_GUIDELINES.md
 (commit: 5faf3ac)

Implement initial version of getAssignmentProgress
 (commit: de2604a)

Add xapiAgent property to RespectSessionAndPerson
 (commit: 5f10957)

Add Uuid opt-in to respect-app-compose and respect-lib-shared.
 (commit: 7827d2b)

Remove unused `SchoolDataSource` import in `XapiStatementExt.kt`.
 (commit: fd555e5)

Add studentsXapiGroup function
 (commit: 7a93561)

Update group filtering logic in `ClazzDetailViewModel.kt` to handle null timestamps and ensure distinct groups are correctly mapped from xAPI statements.
 (commit: e686bec)

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.
 (commit: ebd422f)

Remove unnecessary empty lines in `ClazzDetailViewModel.kt`.
 (commit: b3324ae)

Apply minor formatting and whitespace adjustments to `ClazzDetailViewModel.kt`.
 (commit: b8a2ca2)

Improve error handling and data robustness in student grouping view models and screens.

- Add `Napier` logging and replace potential crashes with safe checks and early returns in `StudentGroupingDetailViewModel`, `ClazzDetailViewModel`, and `StudentGroupingEditViewModel`.
- Refactor `StudentGroupingEditState` to calculate `selectedStudentIds` dynamically from the student list.
- Enhance group filtering and mapping logic in `ClazzDetailViewModel` to handle missing group/member data gracefully.
- Update UI components in `StudentGroupingEditScreen` and `ClazzDetailScreen` to safely handle null items and improve key mapping.
- Delete unused `XapiActorDataSource.kt`.
 (commit: 129ac91)